#24 Irmscher Astra Turbo Coupé
#25 Steinmetz Astra CTS
#29 Vogtland Audi A3 Sportback
#35 Roock Porsche RST 650
#42 Hornstein-Rieger Scirocco convertible
#44 Hartge M3-240
#58 is a Nissan 300ZX with a kit called Techno-Z, probably made by Stillen. The exact car is tuned, engine-wise, by MVP Motorsports.
#64 Project Kahn KSLR
#65 Sportec Audi S3
#72 Novitec Punto GT
#77 ART Viano Sportsvan
#81 Kremer K3?
#95 Lumma BMW 1 Series
#100 Roush F-150?