In Reply to: Tuned up S4 motor... posted by quattro fan on October 10, 1999 at 14:30:31:
: Same motor as S4 just tuned way up with larger (K04 vs. K03) turbochargers. About 350hp. 6-spd box. Look at A4.org for more info.
The RS4 is done by quattro GmbH(Audi subsidiary) in conjunction with Audi AG producing 380 bhp at 6500 rpm (torque peaks at 2,500.) Cosworth did some tweaking on the cylinder heads and intake valves. The suspension is tweaked a little more than the S4 as well.