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Message: <blockquote data-quote="Shocker98GT" data-source="post: 181184" data-attributes="member: 9697">Catbacks may add around 5rwhp at best, and that's a GOOD catback. Weld-ins are nearly zilch. Midpipes, on the other hand, are a place where you can unleash around 15rwhp or so, the stock 6 catted midpipes they put on our cars flow horribly. And midpipes open up the sound more than the mufflers (louder, deeper tone, much more throaty regardless of muffler you choose).Flowmasters sound good, but if you really want to maximize your power potential, flowmasters are some of the worst flowing and performing mufflers on the market today. Really I can't think of many aftermarket mufflers that CAN'T outflow them. If you like the sound of a chambered muffler, I'd steer you more toward the Hooker Aerochambers, or better yet, the Bassani system (Bassanis are really more a hybrid chambered/straight through design). MACs make pretty good power too, they're one of the louder systems out there though. Naturally aspirated the numbers don't show as much, but the second you supercharge or especially turbocharge a car, that's when you REALLY see how good/bad a system performs. I've seen people gain nearly 30rwhp on a turbo car just swapping their Flowmasters to Dynomax ultra flos.</blockquote>