Originally posted by rkneeshaw:

I think thats true even on a 3L. Demon has done all sorts of testing with that stuff, and last I remember has lost power with a 65mm TB. I'm pretty sure he's still using an optimized 60mm TB still with his current 3L and has found it to provide the best gains.



IIRC he showed a loss on his 2.5L with lots of mods. His website says he's using a 65mm TB on his 3.0.

Bottom line - use the 60mm unless you're planning big big mods. Many people report that their butt dynos like the 65mm TB, but it's been shown to lose hp at WOT.

Derek Scion xB 5-spd Previous: 2000 Silver Frost SVT Please share the road with cyclists.