Allright here's the specification of the Audi RS 6 Competition so you know what kind of modifications to look for.
The Audi RS 6 Competition cars were produced to race in the SCCA SPEED World Challenge GT Championship and were built by Champion Racing in our Pompano Beach, Florida shops.
Body:
Audi RS 6 quattro sedan body shell, fully seam welded, and reinforced.
Full alloy roll cage with integrated suspension pickup reinforcements.
Forged Alloy Wheels 18 x 9.5 inches (Champion Motorsports).
Fuel system, 100 Liters capacity (Champion Racing).
Standard RS 6 aluminum fenders and front hood.
Carbon fiber rear deck lid with RS 6 mounted rear spoiler.
Anti-fog front and rear windscreens (Lexan).
Interior:
Motec Data Acquisition system with 40 logging channels.
Recaro FIA Standard drivers seat.
6 point safety harness system.
Full electronic fire suppression system.
Engine and drive train:
475 horsepower RS 6 4.2 liter, Bi-Turbo Cosworth Technologies-prepared V8 engine.
Larger more efficient CTI spec. intercooler, and air charge plumbing.
Larger more efficient CTI spec. air to oil cooler.
Larger more efficient CTI spec. air to water radiator.
3 plate Tilton clutch package, mounted to a Champion Racing Specification single mass flywheel.
6-speed Audi quattro transaxle, with 40:60 torque split front to rear.
Engine management system (Pectel).
Suspension and Brakes:
Ohlins 5 way adjustable dampers.
Eibach competition coil springs.
RS 6 standard braking system, with full floating cast iron rotors.
Fully adjustable, modified suspension arms with uniball joints.
Adjustable front and rear anti-roll bars.
Additional Options:
Carbon fiber door panels and trim.
AP racing on board air jacking system.
6 channel Motorola communication system
Champion Racing carbon fiber front splitter and air dam system.