There was a post a while back about the Zoomers exhaust for the H3. I got one and put it on my demo and love it. There's very good response, it's a deeper sound than the SMA or GM exhuast, and the install was fairly painless. There is a noticeable increase in performance also, I just don't know if that's just me imaginging it.
This isn't an advertisement for them, just wanting to post my comments.
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