Quote:
Originally Posted by ZX-12R  I think the majority of power gains in a full system aftermarket exhaust is due to the reduced back pressure. The tuning of the pipe is the little something extra that makes the better manufactures consistantly show higher gains with their systems over lesser known or cheaper brands.
A slip-on is mostly for sound and looks as you don't often see more than 5HP gains with them. |
This is where we part company. If you are interested take a look at the link I posted above or at SSearchVT's post earlier in this thread.
Most of the efficiency gains are pulse timing and scavenging from what I have read. Lyle Cummings is another pretty good technical writer about this stuff. Heir to the Cummings engine fortune.
Anyhow, if you look around and dig into the SAE kind of stuff I think you'll see it's pulse timing. This is my understanding of it anyhow.