Does a Yoshimura full exhaust or a half exhaust make a difference in weight and performance?

Question

It's for a 2007 GSX-R 600!

Answer 1

Exhaust can bump up performance a little, but what kind of car?

Answer 2

Yes it does. You will notice a difference in hp (usually between 3-6 hp). This may not seem like much but in a motorcycle it does.You may have to remap your bike with a DynoJet Power Commander. Plus the added advantage that it just sounds cooler.