P o w e r co mmander?? =0

OK this is new for me.. can someone explain me this:


why if i modify the pipes of a motorcycle the bike will be fine, BUT
IF i modifie the whole exahust sistem, i will requiere a power comander?..

i ve seen some bikes messed up because they modified the whole exhaust sistem, but twhe u modifie just the pipe seems to run ok.


does it happen with the motorcicles with carburator also? or just the new ones with elecrtronic jets.?..




thanks aaaall ur info guyz!!