There's defiently something that needs to be tuned if that you peak. Not bad gains out of that little 1.5, how much psi? I think 18's are much too big for a little 1.5 to push. Got to be killing your acceleration.Glenn Maurer said:HP @ 4750 IS 123 ATW, WITH LARGE 18"X7.5 RUBBER AND STOCK SCION EXHAUST, WE ARE FINE TUNING THE REGULATOR AND SHOULD END UP AT APPROX. 133/136 ATW @6100. WE WILL BE DOING FINAL DYNO RUNS SHORTLY WHEN THE FPR IS TUNED AS WE WANT. SEE www.highonScion.com for pictures of the car from the Las Vegas SEMA Show last November 03. More content and pictures will be on the site soon.