Originally Posted by SpecializedMountainMoto
Yeah my pipe was way smaller than that, it's the one they sell for motorized bike but does not fit at all. Very small dia piping and tiny chamber
I think I know which one you're talking about... not the banana pipe but the one that's basically a header and has a cone facing the inlet and outlet but no belly in the middle, then maybe a muffler on the end? If it's that one, yes, those are very restrictive... The banana pipe is restrictive too but also tuned so it needs more rpm than one of these engines could spin anyway...