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DynoMax Super Turbos have picked up an additinal 25 horses across the boards on turbo'd stangs. They sound great too, and flow even better than Flowmasters.
A buddy of mine owns a shop, & has a drag car that does 7.20's in the 1/4. He told me that between the three you mentioned Flowmaster offer you a throatier sound, but Magnaflows are currently the most free flowing exhaust on the market. Their sound is a little louder/raspier than flowmaster, but they still sound the part. I have never heard corsas, so sorry I couldn't give my two cents on them. Also, if it matters...Magnaflows have a lifetime warrenty on their stuff, Flowmaster offer a one year.
MAC is really loud. I have a 98 with full MAC exhaust and it rumbles so low it mad my boys foot shake on his acclerator behind me. Its low and has a nice rumble and screams at high rpms...also will give you a nice hp boost
Magns flow has the best flow. When I bought my exhaust I was told the same thing, that their flow is better than flowmaster. The flowmasters are single chamber which is as close to straight pipe as you can get with mufflers, whereas flowmasters are eith dual or three chambered. (Although they might make a single chamber model also.</P>
On another note, of course it is the underside of your car but the magnaflows look a hell of a lot better than the flowmasters, polished stainless steel versus that galvanized metal look of flowmaster, and the lifetime warranty.</P>
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