I think it all depends on the rpm range you ride at. Aftermarket pipes are meant to be run at higher revs and sacrifice low end torque for more peak hp. I'm not going to get into the details of how it works (cuz I don't really know), but you get the idea. I'm sure we have some smart cookies here that can explain it better.so its a good thing to have the pipes connected?
why dont most aftermarket system incorperate this.