Jex mate here is an extract from a convo i had with Fattony when i was thinking about the greddy install...
"330rwhp with Greddy
345rwhp with stock
Difference was the shape of the graphs. Greddy Straight linear line, like a highly strung N/A. Stock was a huge hump, massive mid-range flat-line at peak power from 5750rpm to 6750rpm.
I can't blame the Greddy plenum outright, but I do belive the shorter runners played a part.
Turbo is a 2835 ProS, I think boost came on the same with both plenums.
3rd gear, 21psi, 3500rpm.
2nd gear, 21psi, 4000rpm.
Felt much slower. Its all in the midrange. The extra power 4000rpm -> 6000rpm was the difference. Pedal response ON/OFF/ON throttle is probably better with the Greddy due to the shorter piping. It took some"
was enough to convince me anyway...maybe you could better tune your way around it i dunno...I asked Trent about it and he seemed very, meh whatever about it..