Fazzanut, sorry, but your talking SHITE

Countless SR20s running well over 400bhp for a LOT of hard miles, Phil Morrisons S14 is a good example, current D1GB champ, has about 430bhp from his SR20 with a standard bottomend thats done about 70k IIRC and has about the hardest life any SR20 is likely to get!

And yes, in USA and Downunder theyve seen over 500bhp, and IIRC over 600bhp, on stock bottomend.

But 400bhp on std bottomend can take serious serious abuse and still last.