Quote:
Originally Posted by Gossypiboma
An H-pipe is a rudimentary X-pipe. So there would be zero benefit of having both in an exhaust system. The idea is to create a scavenging affect, but an H type connection does this with 90* angles vs. a smooth transition with an X design.
The Akrapovic system as been shown to have tuning issues and create less power than other catless x-pipes.
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special tunes have been developed that solve the issues and have been around for a long time ... it is not a mystery or a problem.
Arka has been proven over and over again to be one of the best solutions for the s65 and the standard evo is not catless