Hi, I have been reading about it, and almost concord about the size of the track you are running in, small, medium or large.... but how to know this range...
Our track has the main straight about 60mts. and take about 18.5-19sec. to complete a Lap... how you measure the size?? to choose the correct combination of pipe and manifold... (ON ROAD)

thx fot the advise...