Was it a late model? The stats for the 2005+ RS4 speak for themselves:
Engine
Type: V8
Displacement cu in (cc): 254 (4163)
Power bhp (kW) at RPM: 420(323) / 7800
Torque lb-ft (Nm) at RPM: 317(430) / 5500
Redline at RPM: 8250
0-60: 4.8 secs
Thats HUGE power by any standards.
CJ