There are tuned S5's (V6T) which are running 11 second 1/4 mile times. Stage 2 S5's are pretty darn quick. For the pre-facelift V8 cars, JHM (JH Motorsports) offers a supercharger kit. That'll also outrun an E92. Plus, when the E92's rod or main bearings fail, the car becomes as fast as the flatbed that's towing it to the shop.