We had the first and last of a 924 race car, designated 933, in our shop. I think 16 were made by Porsche. The first was a prototype and the last was a body in white. Bob Russo worked on them back in the day and it's listed in one of the big Porsche racing books.
http://www.924.org/models/924D933.htmThese cars were designed by the factory to race in SCCA D Production Championship starting in 1979. The Porsche project number of these race cars was 933. Only 16 were built by the factory. However, if you had the right connections, you "could" buy the parts as a kit from Porsche to convert your street car into a fully race-ready 924. At least that's what they wanted the SCCA to think.
The laundry list of (major) parts in the "kit":
933 motor with 931 head and 11.3:1 compression
Kugelfischer mechanical fuel injection
Intake manifold for Kugelfischer injection with quad throttle bodies
Oil cooler
Tuned header, exhaust, and megaphone (exit RH side of car)
5-speed snailshell-type transmission
Race suspension including rear coilovers
Bilstein monotube shocks and struts
Reinforced A-arms and trailing arms (see below)
Components to lower car by remounting suspension
Heavy sway bars
15x7" BBS 3-piece rims
Solid aluminum mounts for engine, transmission, and suspension
Fuel cell