the x pipe flows better. sounds a raspier than the h.
its the just shape of where the 2 pipes meet. the h is a straight tube that connects them and the x, the 2 meet in the middle.
theres alot of companies, hard to make the decision for you. you defintely get what you pay for. i went with the cheapo BBK hpipe. sounded pretty good but was low quality and didnt fit as well as i'd like it to. that and you had to clamp together the h in the middle. looked ugly.
also if you're eliminating your smog pump along with the cats get one that doesnt have the AIR tube on it. its pointless to have
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