I can really recommend the RUF R Kompressor.

0-200 km/h in about 13.5 secs. 2 year warranty.

http://www.rs6.com/forum/showthread....&threadid=9094

 

I will say that we have installed dozens of superchargers on the 996 (Evo), and have never had a hint of a problem with any of them. One chewed up a serpentine belt at about 30k miles on the kit, but that is it, which isn't bad for a belt of that length. I currently have 2 997s' on the road with the Evo kit as well, and they are out beating up on vettes and vipers, lol.