I went with XtremeFlow. Their explanation about getting good low and mid-range rpm power made sense to me. I'm not driving around at redline very much. It's also the only one designed specifically for the H2, and not a truck muffler. The two-stage design looks cool and seems to work. Sound is mellow, but mean. I'm diggin' it. Did the air intake at the same time. They have a kit price for both. I'd do it again.
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