We all know thunderbike pipes are said to require no other mods to gain the performance boost advertised. And thats listed as a pretty substantial boost. Sounds a bit hard to believe actually. But what if you DO re-jet and do airbox mods or removal? Will it be even better? I can't imagine a bigger boost w/o major engine mods, but on the other hand how can pipes alone without jetting/airbox mods even get what they advertise in the first place? Kinda goes against conventional wisdom of needing to open up BOTH intake and exaust doesn't it?
