Originally Posted by
Jspeed
My "GT Open" car has the Sirio CL7R STI .21 On-Road engine.
Both .28s & .21s seem to have different advantages to them.
At Ipanema Sports GT events, you can use any header/pipe combo you want in our "Open" or "Spec" class.
so some onroad engine work well with the weight of these car because friend of mine have O.S. .21onroad and its not doing the job in his DM-1, my other friend have hyper 9 port not doing the job as well they can't keep up with my GO-7port, i like my GO but i sort of looking at the picco & nova onroad engines...kinda miss the speed of my mrx4x so im looking for opinions thanks