by crfsonly » Wed Apr 17, 2013 2:13 pm
as you know an engine generates power by igniting an air/fuel mixture in the combustion chamber. the more air and fuel you can get into the combustion chamber the more power is produced. once the fuel is burnt it has to be evacuated to make room for a new batch of air/fuel. so, the exhaust does matter. the more spent fuel can be evacuated the more room for new air/fuel. so, these aftermarket exhaust to help performance especially when combined with intake modifications. the biggest bang for your buck is going to be our PowerUP jetting kit along with a new free flowing air filter like the Twin are we carry. then you can add an exhaust but i would start at least getting the jetting correct with a free flowing air filter.
ken