Neil- modified GT30s don't count.

 

Is there any other kind?

 

so the just is noone has done this with anything smaller then GT35's? 3.8 n almost 2bar boost

 

Well this may not count but Sledge (997tt) was running modified 30r's (35's are lag pigs, you wont like them) and laid down 915rwhp on the stock engine and is tied for the 60-130 record with a built motor 996tt (Art's BBI beast).