I've got the long headers that bolt up to the cats and I received a noticable hp improvement. I'm told the short headers sound louder than stock, but really doesn't provide horsepower improvement. My headers required some welding by the installer. From what I can remember it only took them two hours to R/R. I installed the cat-back system and it took 2 hours at the most. No need to lift the vehicle you just need a hacksaw to cut the tubing behind the rear axle and the willingness to get a little dirty.
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04 H2 Black LUX, Air suspension, NAV, Basanni Cat-back exhaust & full ceramic headers, Airaid Intake, Audiovox headrest DVD system
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