According to Sport Compact Car Magazine, the 2007 Ultimate Street Car is a 2001 Audi S4. For those not in the know, the Ultimate Street Car Challenge is an annual two day event hosted by the editors of Sport Compact Car Magazine. Competitors from all over the country are hand selected to battle it out in every aspect of custom street car engineering. These are not trailer queens, people. They are real, street driven monsters. Performance and appearance are not the only deciding factors; emissions, fuel economy and ride comfort make up a significant portion of the score, as well.

This year's winning 2001 Audi S4 belongs to Brent Mattraw and was tuned by Torque Factory in Venice, California. The Audi's winning combination did not come from intensive custom fabricated modifications or all out engine blueprinting, but rather attention to the Audi's weak points. The S4 kept its sophisticated European luxury style but received stronger connecting rods, a better sealing head gasket, higher flowing turbochargers and a reworked differential along with a few other bolt-on performance bits. However, the car was not completely devoid of potential deal breaking modifications. It uses a little bit of nitrous to help get the job done.

The Audi beat out a handful of other well qualified vehicles to be crowned champion. They include a C5 Corvette Z06, Infiniti G35, Subaru WRX STI, R34 Nissan Skyline GT-R, Nissan 300ZX, Toyota Supra, Acura Integra, BMW 2002 and even an Ariel Atom. Check out the Nov. and Dec. 2007 issues of Sport Compact Car Magazine to learn the gory details of the competitors and results.

[Source: Sport Compact Car]