all depends wot the engine is being asked to do , and of couse the amount of fuel your chuckin in !! you obviousley need enough pipe area to dispose of spent gasses without causin an obstruction , as i said earlier my mate has fitted serpant headers to his buell , these are supposed to smooth the passage of gasses (stop tumblin ) to give less resistance , they look like some yts lads had a go with the pipebender to me , but there supposed to work !!!! any way these are just my opinions , i,m a buildin site labourer after all
