Does anyone know if the stock header pipe has any restriction where it bolts up to the motor? On mopeds the pipe usually has a welded area that makes the diamater of the pipe actually smaller. If u drill that out you gain power anyone know??
The restricter on the stock pipe is the catalytic converter. Switching to a slipon makes almost no power. Switching to a full system has been proven by our members to gain about 1HP at the wheel. The difference all seems to be in the header pipe.
Aftermarket headers have a larger bore, smoother bends, and no catalytic converter.
I have checked and there are no restrictions other than the factory design. I have also removed the rear muffler cone which is only for aesthetics, the muffler is completely welded. I'm going with a full system myself.