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You mean mid pipe. I like the sound of the H better after all. The H gives you a deeper tone, and the x gives you a higher pitched tone kinda like a nascar. If you want deep, go with H.
I put a Magnaflow catback on my car a week after I bought it, and even though it had a good sound, it wasn't loud at all. I was just wanting something different from everybody else I knew who had Flowmasters. Well, I rectified that situation last weekend when I put on a Mac o/r H-pipe. It sounds mean as hell now.