mine clocked 110mph on the 1/4 mile which i think is about on par with a stage 3 saph? it did have a few extras though. and it was only 2wd. it got to the end of the speedo very easily as well. never had it on a set of rollers where it would stay on them but as you say you wont get much past 300hp on the standard turbo,its about the same size as a t3.