When I first got my engine. Someone had welded some 550 pipes inside the collars so they wouldn't leak by and cut them off about a foot long. With the smaller tube and the short length it sounded like a top fuel dragster. Really woke up the neighbors. Then when I changed to the mac drags it was still loud but a lower tone. But the power really didn't change (that I could notice) one way or the other.

Just my $.02 again

ONCE-A-NITE