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I mean the X is gonna be a little raspy, which I don't mind. It seems the UPR one isint as bad as the other brands. I've been trying to find a video with a o/r H but cant find one. You can pick up like a Mac o/r H for $140, there pretty cheap.
Here is a vid of a o/r H & borla stingers on a mach1. I believe its the second part of the video. It sounds good, Now I don't know which one to get H or X lol.
Is there any performance difference between a o/r H & X?
Technically, the X would provide better top end power while the H would be better for power down low. I really doubt there would be any SOTP difference though.