On a stock KZ440, if I stick with the stock air filters and airbox, would the installation of a 2 into 1 exhaust that was fully baffled and quiet, necessitate carburetor re-jetting? I'm thinking along the lines of weight reduction.
It all depends.....
If they flow about the same, no.
Whit that being said, changes to the exhaust have less than half the effect than that of the intake.
If you are thinking of the factory 2 into 1 it is quite restrictive.
