Lightweight Carrera Confusion - Second Edition

By Bob Gagnon

This article is a revision of my article “Lightweight Carrera Confusion” which appeared in the May 1993 edition of Porsche Panorama, the monthly magazine of the Porsche Club of America,

For Europe in model year 1992, Porsche produced a lightweight road version of the Carrera 2 called the Carrera RS which was available in 3 variants for road use and also a for racing only fourth variant, the Carrera Cup racing car.

For the United States and Canada in model year 1992, Porsche produced the limited production Carrera Cup USA Edition and introduced the RS America, both of which are also lightweight road versions of the Carrera 2.

This article will discuss the history and differences between the normal Carrera 2 and these lightweight Carrera 2 cars.

The 1992 European Carrera RS

Porsche has a long history of developing and selling special performance versions of their normal product line for both street and racing use. Of these cars the Carrera RS versions of the 911 are probably the most famous. The first of the Carrera RS cars was introduced in 1972 when Porsche introduced the Carrera RS 2.7 lightweight as a homologation basis for a GT racing car, the Carrera RSR 2.8. These cars were extremely successful both on the sales room floor and at the racetrack and ultimately evolved into the Carrera RS 3.0 road cars and Carrera RSR 3.0 racing cars. Porsche did not import RS 2.7 and RS 3.0 road cars to the USA.

Twenty years later during model year 1992, history repeated itself when Porsche developed a special performance version of the 1992 Carrera 2 called the Carrera RS, again not imported to the USA.

The 1992 Carrera RS was conceived primarily as the basis for a competition vehicle to be used for FIA Group N (large series production based touring cars) or FIA Group GT (Grand Turismo) racing, as well as a basis car for the factory’s popular Carrera Cup racing series.

In creating the 1992 European Carrera RS, every component of the 964 Carrera 2 suspension, braking, and power train systems was changed in the interest of higher performance. Porsche extensively applied design features used in the 172 Carrera 2 based Carrera Cup racing cars produced for the 1990 and 1991 racing seasons.

There were three M optional versions based on the so called: “Carrera RS Basic” offered in model year 1992:

The RS Basic, M002 and M003 types were approved and sold for road use around the globe for model year 1992 only, excepting the USA.

The M001 Carrera Cup racing car was not approved for road use anywhere and was built for racing customers only using the 964 RS chassis in both model years 1992 and 1993.

The 1992 Carrera RS Basic and M002 Touring cars have VIN numbers with a 9 series thirteenth digit (9= Carrera RS) reserved for them in the range: WPOZZZ96ZNS4 9 0001 to 2500.

The 1992 M003 Competition versions have VIN numbers with 99 as the thirteenth and fourteenth digits reserved for them in the range: WPOZZZ96ZNS4 99 001 to 300

The 1992 M001 Carrera Cup racing cars built have VIN numbers with a 9 as thirteenth digit and an 8 as the fourteenth digit reserved for them in the range: WPOZZZ96ZNS4 98 001 to 150.

In 1992 Porsche built 2282 road cars distributed as:

 In 1992 Porsche built 112 M001 Carrera Cup racing cars.

The 1993 M001 Carrera Cup racing cars are in the “P” series VIN range WPOZZZ96ZPS4 98 001 to 999.

I have no data on the number of Carrera Cup cars produced in 1993. No Carrera RS Basic, M002 or M003 cars were built in 1993..

Engine serial numbers for all 1992 RS variants are in the sequence 62N80001 to 62N 90000, 1993 Carrera Cup cars have engines in the range 62P80001 to 90000.

Gearbox serial numbers for the type G50/10 gearbox for all types are in the sequence starting: G5010 2 000001.

The RS America

The RS America was introduced in 1992 as a performance oriented lower cost alternative to the regular Carrera 2. All RS America's are technically 1993 and 1994 cars, even though production of the cars actually began in January 1992.  August is the usual month when Porsche does its new model change over and the month when the other model year 1993 Porsches began production.

The RS Americas built between January and August 1992, a total of 294 cars, have VIN numbers in the 1993 "P" series range, with a 1 series (1=RS America) thirteenth digit and an 8 as the fourteenth digit reserved for them in the range: WPOAB296?PS4 1 8001 to 8293.

RS Americas built after August 1992 have VIN numbers in the sequence with a 9 as the fourteenth digit reserved for them in the range:  WPOAB296?PS4 1 9033 to 9368 (335 cars).

RS Americas built after August 1993 have VIN numbers in the 1994 “R” series cars with numbers in the range: WPOAB296?RS 1 9067-9139 (72 cars).

The “?” in the USA VIN Number indicates a randomly generated number which can be the numbers 0 through 9 or the letter X in the United States only.

Engine serial numbers for the first 294 cars are in the 1992 "N" series range, 62N 00001 to 20000. Engine Serial numbers for cars built after August 1992 are in the 1993 "P" series sequence 62P 00001 to 20000 and engines built after August 1993 are in the “R” series sequence 62R 00001 to 20000.

Gearbox serial numbers for the G50/05 type gearbox for all RS America cars are in the normal Carrera 2 sequence G 5005 1 000001 without LSD or G 5005 2 000001 with LSD option M220.

Total production was 701 RS America cars. The RS America was offered for sale in the USA and Canada only.

The Carrera Cup USA

In the early 90’s Porsche instituted a very successful racing series in Europe called the Porsche Carrera Cup. The Carrera Cup at the time was a racing series featuring specially factory modified 911 Carrera 2’s running as a support race during Formula 1 race weekends like the Porsche Supercup series today.

In 1992 Porsche Cars North America (PCNA), hoping to emulate the success of the International Race of Champions (IROC) races of the early 1970’s, sought to develop a Carrera Cup series in the USA. The plan was that teams would pay around $100,000 for a car specially prepared for a USA Carrera Cup racing series that would support professional races here. As in Europe, no further modifications to the cars were to be allowed except for wheel alignment, wheel weighting and sway bar adjustment. The engines were to be sealed so that internal modifications were not possible. All teams were to use Toyo tires. The Motronic engine management brains for each race were to be handed out to the teams by the organizers before each race and then collected after each race. Now all that was needed for this plan to work were racing cars and teams that would buy the cars and race them.

Production of a suitable racing car for the series turned out to be a little tricky. The simple solution car would have been for Porsche to build a run of Carrera Cup cars for the series and import them as was done with the IROC Carrera RS 3.0 based series cars in the 1970’s. I have been told that this was not feasible in 1992 because of some trouble Porsche found itself in during the 1980’s with the US Federal Government after Al Holbert, then director of Porsche motorsport activities in the USA, imported some European Porsche 959 cars as “racing cars”. When the Environmental Protection Agency and Department of Transportation decided that the 959’s were more likely to end up on the street than on a racing track they were impounded and sent back to Germany. Porsche was put on notice that any “racing car” that “looked like” a street-type car had to meet EPA and DOT laws. PCNA was sensitive to the fact that anything they import may be sent back to Germany by the US Federal Government if it didn’t meet federal regulations.

At the time the 1992 964 Carrera RS served as the basis car for the European Carrera Cup, just as the 996 GT3 serves as the basis car for the Supercup series today. Therefore, for the proposed USA Carrera Cup, PCNA asked Andial/PMNA to coordinate with Porsche AG a limited production run of USA legal cars similar to the European Carrera RS. Andial/PMNA would then be contracted to convert these road legal cars to Carrera Cup racing cars for the racing series. Forty-five “Carrera Cup USA Edition” cars were specially produced and sent to the PCNA port in Charleston, W. Virginia.

Twenty-nine of these 45 cars were shipped from Charleston to Andial/PMNA. Of these, 25 were converted to the full Carrera Cup racing specification and 4 had their engines sealed, checked on the dynamometer and their clutch plate changed to the racing unit. These 4 cars were to be used as parts cars and were otherwise unchanged from the way they were imported. These 29 cars were then shipped to Reno, Nevada for storage at Porsche Cars North America.

The cost of producing racing specification cars in this way was high and PCNA tried to pass on this cost to racing teams, so finding enough teams to buy and race the cars proved impossible. In addition the weak American economy in 1992 reduced the hoped for sponsorship support and the series was cancelled by PCNA before it began.

After the Carrera Cup USA series cancellation, the 29 racing and modified cars were returned to Andial and reconverted back to their original street legal specification as originally imported. The only remaining elements of the conversion are 2 tubes left from the roll cage on each side of the engine compartment, remnants of the roll cage weld pads inside the car and the stiffer steering coupler links were also left in the cars. The cars were then shipped from Andial back to the Porsche port in Charleston, South Carolina for final carpeting and paintwork before shipment to dealers.

Sixteen of the original 45 cars were never shipped from South Carolina to Andial in the first place and were sold as they were imported.

Probably since PCNA was sensitive about the cancellation of the racing series there was no national advertising program about the cars availability other than a letter to Porsche dealers. All 45 cars were sold quietly through the regular dealer network as a model officially called the Carrera Cup USA Edition.

The cars were delivered with a dash plaque indicating each cars VIN number and their Carrera Cup USA Edition status. The 25 cars that were converted by Andial/PMNA to full race specification also have a separate sub-serial number engraved on their dash plaques numbering them from 92-01 to 92-25 (92 for the year 1992, 1-25 for the cars conversion sequence).

Carrera Cup USA Edition cars have standard USA Carrera 2 VIN numbers with a 2 series thirteenth digit (2=Carrera 2) in the range: WPOAB296?NS4 2 XXXX, where “XXXX” represents the serial number of the chassis.

The USA Carrera Cup edition cars were built non-consecutively on the production line and have serial numbers ranging between 0392 and 0602, inclusively. Serial number 0392 was a pre-production car. Production really began in earnest with serial number 0509 so, during the actual period of production, approximately every other car on the production line between 0509 and 0602 was a Carrera Cup USA car.

Gearbox and engine serial numbers are in the identical range as the European Carrera RS cars shown above.

Comparing the Bodywork

Table 1 offers a comparison of variations in the bodywork, Interior trim, and electrical equipment.

Note that the USA Carrera 2 is heavier than the European Carrera 2 due to the addition of the 5-mph bumper system, airbags and air-conditioning that are standard for the USA.

The RS Basic

The Carrera RS Basic utilizes the standard European Carrera 2 body with a retractable spoiler. Weight is saved by deleting Carrera 2 standard equipment such as, radio (the windshield antenna and basic wiring are retained so a radio could be fitted if required), cruise control, electric window lifts, central locking and alarm, interior lighting, electric mirror adjusters, fog lights (replaced with dummy lights), rear window defroster wiring and relays are all deleted to save weight (the rear widow does have heating elements on the glass but they are not activated since the battery is only 36 AH)

The Carrera RS Basic interior is lightened by the use of lightweight carpeting which also replaces the seats in the rear, lightweight door panels, fibreglass bucket seats, simplified trunk carpeting (which only covers the spare tire) and a simplified plastic cover for the forward trunk bulkhead. Further weight is saved by use of a simplified wiring harness, an aluminium hood, a small 36 AH battery, thinner (3 mm versus 4.7 mm) glass and a 1 litre windshield washer tank. Interior sound dampening in what would be the rear seating area is deleted. A larger 92 Litre gas tank is fitted. The rear bumper all the European Carrera RS variants is a unique 11 pound lighter design. 

Many changes are made to the body shell of the Carrera RS Basic to make it suitable for N/GT and Carrera Cup racing. For those of you interested in the complete scope of the changes, refer to the Carrera 2/4 Workshop Manual, Body Volume V, pages 50-101 to 53-104.

Briefly, these modifications include:

1) Installation of mounts for:

2) Seam welding and plating of the rear suspension mounting points, rear floor area, transmission and stabilizer mounts,

3) Removal of rear seat brackets, seat belt mounts, and trim brackets. .

4) Fender lips rolled for tire clearance front and rear.

Undercoating is deleted on the RS Basic so it only has only a 3-year rust warranty.

The RS Basic weighs 2684 pounds (including approximately 25 pounds more fuel in the 92 litre fuel tank compared to the normal 77 litre tank).

The Carrera RS Touring M002

The M002 Carrera RS Touring’s bodywork is different than the RS Basic. The interior is largely the same as the standard Carrera 2 with the usual Carrera 2 door panels that include radio speakers and pockets. Sound dampening is used in the rear seating area but seating is replaced with carpet as on the RS Basic. Sport seats, usually optional on the Carrera 2, are standard and replace the fibreglass buckets of the RS Basic. Front trunk carpeting and trim are as a standard Carrera 2. Other equipment is included such as alarm and central locking systems, interior lighting, 72 AH battery, 7.4 litre windshield washer tank, power windows, antenna amplifier, 92 litre fuel tank and an operable heated rear window.

The extents of the bodywork modifications cited above for the Basic car in the factory manual are limited in the M002 Touring car. Certain operations such as removal of some interior brackets, installation of 6-point harness mounts, alternate location of the ABS brain, provision for a smaller battery and installation of the trunk mounted battery switch and smaller windshield washer bottle were not performed on the Touring RS car. The Touring RS also has undercoating and a 10 year rust warrantee.

The RS Touring weighs 2904 pounds (including approximately 25 pounds more fuel in the 92 litre fuel tank compared to the normal 77 litre tank).

The Carrera RS Competition M003

The M003 Competition option included the following modifications to the RS Basic:

1. Deletion of interior carpeting, headliner and A/B pillar covering.

2. Painting of interior to match exterior colour.

3. Shortened knee padding on lower dashboard to clear roll bar installation if ordered.

4. Driver's side sun visor only.

5. Provision to unlock trunk and fuel door from drivers seat

6. Engine compartment insulation deleted

7. Six point seat belt for driver and passenger.

8. DME Brain box moved behind drivers seat (standard location under seats in way of crotch belts mounts).

9. Hand held fire extinguisher mounted on passenger floor.

10. Cable activated master switch from inside of car

11. Recaro SPG bucket seats for passenger and driver.

 All the European RS cars have a "Carrera RS" emblem on the deck lid, which is also optionally available on the side of the car as script along the door bottoms.

The RS America

The RS America deletes the usually standard, in the USA, Carrera 2’s air conditioning, radio, sunroof, electrically adjustable mirrors and cruise control to reduce weight and cost. The rear spoiler is a fixed, non-retractable “tray” type as on the earlier 3.2 911 Carrera. 

In the RS America a simplified lightweight interior uses the RS Basic door panels but with radio speakers installed and a lightweight interior carpeting material used. Front seats are cloth covered sports seats. The rear seats, trim, rear radio speakers are eliminated and replaced with carpeting and, for the model year 1993 cars, a package tray that has doors to seal the storage areas below it. Model year 1994 RS America cars had the same rear seats as standard Carrera 2.

On the deck lid “RS America” script appears and "RS" is written on the sides of the car ahead of the rear wheels

It is not clear how many of the body modifications of the European Carrera RS have been carried out on the RS America. The earliest cars had basically the same body modifications as a European RS Carrera Touring car. Later cars did not have the rolled fender lips rolled. I think this change probably happened after August 1992 when the factory stopped production of the European RS car. 

The RS America weighs 2954 pounds

The Carrera Cup USA Edition

The Carrera Cup USA Edition car is essentially the European RS Basic but equipped with the following added safety equipment to make the car USA legal along with some other changes to facilitate it’s ultimate conversion to an M001 Carrera Cup racing car:

1. Airbags (legal requirement)

2. Centre high mounted stop light with associated thicker rear window glass (legal requirement)

3. USA 5 mph bumpers (legal requirement)

4. A door-less rear package tray (Porsche apparently does not want the seat pockets remaining in the rear to potentially be used as seating without seatbelts),

5. Standard seats (to be replaced with a racing seat)

6. Alarm and central locking system (legal requirement, Porsche chooses this rather than stamping numbers on body parts)

7. A 77 Litre gas tank (92 litre not approved for USA)

8. Power windows (manual windows winders won't clear the airbag dash padding)

9. Interior lighting (part of American wiring)

10. Fog lights (part of 5 mph bumper)

11. A 7.4-liter windshield washer tank (no support for 1 litre bottle in USA harness)

12. Standard USA wiring harness (required to support the added electrical equipment) 

13. Deck lid and sides are free of any model designation.

14. Aluminium 7 and 8 X 17 inch wheels as on RS America (Aluminium 8 inch rear wheels were needed for the front in the Carrera Cup racing conversion)

15. Deletion of emblem script on deck lid.

 The Carrera Cup USA body was created using a so-called  “body in white” as for a USA airbag equipped car and performing the workshop manual operations listed above for the European Carrera RS Basic. Three of the operations listed in the workshop manual were not performed though: adding the bracket for the small water bottle, deleting the bracket for the large water bottle and removing the brackets for the rear seats.

Carrera Cup USA car serial number 0392, the pre production car, is slightly different from the 44 other cars in that it had the bracket for the small RS water windshield washer water tank installed and had the brackets for the rear seating removed. The carpeting was also tightly glued down. Subsequent cars did not have the water bottle bracket, the rear seat brackets were not removed and the carpeting was barely glued into the car to facilitate removal when the car was converted to a racing car.

All Carrera Cup USA Edition cars were white excepting one India Red car, thought to be dedicated as the series pace car.

The Carrera Cup USA has no official weight quoted for it, although a letter to dealers claimed "approximately" 2760 pounds. My Carrera Cup USA with all fluids weighed 2835 pounds on a certified truck scale.

Comparing the Cars Mechanically

Table 2 shows the RS America suspension is the same as that optionally available on the standard Carrera 2 as option M030; changes consist of a larger front stabilizer bar, stiffer 911 Turbo progressive rear springs and firmer 911 Turbo shock absorbers.

Porsche changes essentially every component of the standard Carrera 2 suspension to create the Carrera RS and Carrera Cup USA suspension. The suspension of the Carrera Cup USA and the Carrera RS is considerably firmer that that of the RS America. Firmer Shock absorbers and stiffer progressive rate springs are added at all four corners. The front stabilizer is adjustable to tune handling to driver preference. To reduce camber change in the front suspension during cornering, harder suspension bushings are used in the lower control arms and the upper spring strut mount is of a ball joint design. To reduce weight, steel front hubs are replaced with aluminium hubs. In the rear of the RS and USA Cup, the stabilizer bar is also adjustable. Spacers are added to the control mount (outer suspension bushing) to eliminate rear wheel toe in on trailing throttle during cornering, the so called: "Weissach Axle” effect. The rear control arm adjustment plates are modified and are different left and right. They can also be flipped side to side, which allows more negative camber for racing applications. The upper shock mount is changed to a ball joint design, similar to that used in the front. Overall ride height is approximately 40 mm lower than a European Carrera 2 and 50 mm (~2”) lower than a USA Carrera 2. Alignment is set with one degree more negative camber front and rear. The Carrera RS Touring and Basic have genuine magnesium wheels that are 17” diameter and 7.5” and 9” wide front and rear respectively. These four magnesium wheels save a total of 10.6 kg (23.3 pounds) of weight, compared to aluminium wheels. The RS America and Carrera Cup USA both are equipped with the 7x17 (front) and 8x17 (rear) aluminium wheels that are optional on the standard Carrera 2.

The standard Carrera 2 and right-hand drive Carrera RS models are the only cars with power steering; all other Carrera RS and RS America cars have manual steering.

Table 3 compares the engines of the three cars.

The RS America and the Carrera 2 share basically the identical engine but the RS America engine deletes the power steering pump drive.

The engine in the Carrera RS and the Carrera Cup USA is a "blueprinted" version of the Carrera 2 engine. Pistons and cylinders are selected to optimize power output and minimize variation in output between engines. A sports flywheel, seven kilograms (15.4 lbs.) lighter than the Dual Mass unit is fitted. The drive belt system is simplified from two belts to one belt and the fan belt monitor is eliminated, the alternator light now serving this purpose. Engine mounts of the Carrera RS and Cup USA are changed to a solid rubber design. The suction oil line from the oil tank to the engine is flattened to improve rear tire clearance. The power steering pump drive is eliminated as on the RS America. The Carrera RS and Cup USA have a remapped DME chip that has more aggressive timing advance characteristics and thus produces ten more horsepower. Because of this the RS requires a Research Octane Number (RON) + Motor Octane Number (MON) /2 fuel of:  98+88/2 =93 octane gas. The standard Carrera engine requires a 95+85/2=90 octane fuel.

The 29 Carrera Cup USA engines that were dynamometer tested at Andial/PMNA did not vary more than 1.5 horsepower from 275 SAE in race trim with no mufflers and a modified air cleaner on 92-octane gas. Porsche reported on delivery to Andial/PMNA that seven of the Carrera Cup engines had cam timing within spec, but settings not identical to the other 38 cars; these seven engines were corrected at Andial/PMNA. Andial/PMNA preformed no other engine modifications other than sealing them to make tampering impossible.
 

Table 4 shows that the G50/05 gearbox of the Carrera 2 and RS America are identical and a 40% disc type limited slip differential was optional.

The G50/10 gearbox of the Carrera RS and Carrera Cup USA has a standard limited slip differential of the variable 20/100 percent type as on the Turbo. This limited slip provides a 20 percent locking factor on acceleration, but "locks up" to a 100 percent factor on trailing throttle to minimize drop throttle over-steer. The gear ratios of the G50/10 have been made closer by changing both first and second gear of the turbo. The ring and pinion are slightly higher numerically (i.e. lower).

The synchronizers of the G50/10 gearbox are made of steel and modified for quicker shifting for gears one through four and the transmission mount is made of firmer rubber.

The shift lever on the Carrera RS and Cup USA is modified to shorten the throws and move the lever closer to the driver.

 

Table 5 shows that the Carrera 2 and RS America share the identical vacuum boosted braking system.

The Carrera RS variants and Carrera Cup USA have a completely different braking system than the Carrera 2. On these cars, the larger diameter, thicker, cross-drilled front disc and larger calliper of the 964 Turbo are used. In the rear the calliper and disc designed for early Carrera 2 based Carrera Cup cars is used. This calliper body is the same size as the C2/Turbo rear calliper and has four pistons of the same size as the Turbo but it is made to accommodate the thinner, cross-drilled Carrera Cup disc (Turbo discs are 28 mm thick).

The RS/Carrera Cup USA boost system is of the hydraulic type as used in the Turbo and Carrera 4 but with a reduced booster factor of 3.6 versus 4.8:1 on Turbo. This, coupled with a larger 25.4 mm master cylinder versus 23.18 mm on Turbo, gives the Carrera RS and Carrera Cup USA cars a very firm pedal feel.

The Carrera Cup Vehicle M001

The M001 Carrera Cup racing car is not certified for road use and included all the M003 Competition modifications listed above plus the following

The USA Carrera Cup Edition cars had all the M003 and M001 modifications performed by Andial/PMNA to become Carrera Cup racing cars, excepting as noted below.

1. Stiffer springs and shock absorbers with a different monoball mounting front and rear.

2. Longer 66mm rear wheel studs with 21mm rear spacers for 68 mm offset wheels (not used in 1993 season).

3. Aluminium 9.5” X 17”, 68mm offset wheels in rear. (9.5” X 18” 47 mm offset, 3 piece wheels for the 1993 season cars).

4. Aluminium 8” X 17”, 52mm offset wheels in front (same as RS America and Carrera Cup USA rear wheel, changed to 8X18, 3 piece wheels for 1993 season)

5. Further lowering to just clear a 100mm block and changing of alignment to -2°30' negative camber front and -2°20' negative camber rear and corner weighting. The unique RS rear adjustment plates are flipped left to right to achieve this setting.

6. Steel lug nuts

7. Size 235/45 front tires

8. Installation of ABS defeat switch on dash as well as an ABS high pressure defeat switch on the master cylinder, this modification allows the driver to turn off the ABS manually at the dashboard or with very high brake pedal pressure. The American Cup cars required a special wiring harness to do this since the wiring harness in these cars is the standard American harness. Carrera Cup cars in Europe use the connections in the European RS harness that are already provided. 

9. Removal of brake backing plates and installation of protecting shields and boots to protect ABS wiring from heat

10. Removal of the brake-proportioning valve.

11. Pagid racing brake pads without wear sensors

12. ABS brain moved to the alternate mount above original to protect it in a crash.

13. Straight pipes replace mufflers (catalytic converter remains).

14. Modification of air cleaner to eliminate silencing and improve airflow.

15. Removal of engine mounted heater blower and replacement with bypass pipe.

16. Dynamometer test of engine.

17. Clutch plate replaced with racing style plate.

18. Matter Roll Cage installed (a “Z” option in Europe for M003 cars).

19. Removal of fog lights and replacement with red painted aluminium plates (not required on European car which uses the RS false fog lights).

20. Removal of both airbags and lower dash padding (not required on European car).

21. Removal of alarm and central locking system (not required on European car).

22. Towing hooks installed front and rear.

23. Removal of the front bumper alloy beam and hydraulic mounts.

24. Removal of clutch helper spring at clutch pedal.

25. Camber brace installed across front struts.

26. Driver’s side window safety net installed.

27. Clear Vinyl helicopter tape covering of headlights.

28. Wooden drivers floorboard, removal of rubber floor padding.

29. Removal of oil cooler fan, installation of duct plate to guide air to cooler.

30. MOMO steering wheel with horn and turn signal contacts removed (USA cars only).

31. Hood pins installed (USA cars only).

32. Stiffer rubber front stabilizer bushings installed.

33. Stiffer rubber steering couplings installed.

34. Exterior activation of the kill switch with a cowl mounted knob.

35. A Recaro SPG bucket seat covered in cloth for driver only.

36. Solid magnesium engine mounts and a stiffer rubber transmission mount (European Cars only).

37. Spherical bearing drop links for rear stabilizer bar (European Cars only).

38. Rear trailing arm adjustment plates swapped side to side for more negative camber.

39. Removal of engine belly pan.

The M001 Carrera Cup cars do not have any “Carrera RS” labels on them.

The Carrera Cup racing cars weighed approximately 2520 to 2540 pounds.

Sources