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I've only found one article where flow tests were done on mufflers http://www.magnaflow.com/05news/magazine/05hot.htm Does anyone else have any data? I'm liking the Magnaflow and trying to find info on the FR500 (or whatever else has been researched) Thanks guys

Any data out there supporting hp/tq gains of upgrading to performance mufflers only (using stock pipes), versus the gains obtained with a catback system? Thanks