172cup turbo & rx8
I'm sure iv read that ph1 exhaust ports are better/larger than ph2's
If you where to build a fresh f4r from scratch with a sensible budget would you always start with a ph1 head or can the same results be had from a ph2 with headwork and is that the only performance difference?
If you where to build a fresh f4r from scratch with a sensible budget would you always start with a ph1 head or can the same results be had from a ph2 with headwork and is that the only performance difference?