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An H-pipe works by giving the air in the exhaust tubing an alternate path when it gets backed up and it also scavenges the air helping get the pressure equal through-out the system. An X-pipe works the same way but when it comes to the x junction, the air can go either way with more ease and creates a smoother flowing exhaust.
 

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well an x-pipe is not going to help you muc more than an h-pipe until you're pushing some serious power. You'd be better off with an h-pipe until then. And then you could just have someone make an X to weld in place for you.
 
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