If I were to pickup the HMF slipon DO I HAVE TO REJET? Some people say yes some say no?!?!?!?! Well I know I should put the jet kit in for best performance but what if I wanted to just get the slipon for now. I know the jet kit helps on the air/fuel mixture into the engine but on the exhaust stroke the intake valves are closed and the exhaust is pumped out so if you say yes I have to rejet by adding a slipon can you explain why? By adding a better flowing exhaust why would it call to rejet? The intake and exhaust strokes are 2 different actions?! right....

any input would be appreciated
thanks

 

you would have to rejet, that pipe flows pretty good. call hmf they would know for sure.