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Originally Posted by ascheier
I have headers, a high flow cat, 2.5 inch piping all the way back, and a really, really, crappy muffler.
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quick questions for you, what engine do you have? what size high-flow cat? what headers?
if you have an h23 you'll have a smaller diameter collector on the header, then you're wasting power by using the larger exhaust pipping as you need as much back pressure as possible.
if thats the case, then i'd go with a new catback system.
if you have an h22 the collector size on the header would be determined by what header you have, then you can just search for any glass-pack universal muffler.