Well, I can help you out with both. My itr had the comptech on it, and my wife's ls has the n1 on it. I like them both, and you get about the same hp gain. The N1 is peakeier and has higher hp in high rpm, were the comptech has a broad power band. The comptech sounded nice, didn't buzz, wasn't to loud, but sounded mean when full throttle. The N1 is loud as hell. Has that import buzz to it, but looks cool with the slanted tip. The comptech is fairly low key and is almost a chromed stock look. Hope this helps. Me personally, I would get hytech if I had a second chance. Out of the two I would get comptech because of the broder powerband, although you don't notice to much gain from a cat-back on an ITR.