I know that you like a lot the KKK turbos, but still there are new options coming to the market. They flow a lot more air, and it is said to reach easilly 540 HPs. Costs are not bad.
Have a look:
http://forums.audiworld.com/s4/msgs/2040649.phtml
and
www.atpturbos.com
I can only imagine what a GT 25/28 could do on our cars.
Best Regards
WOT FREAK
