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I have to say IPD and the other guys have a really good reputation as far as performance. The only other SENSIBLE alternative is to find a good performance muffler shop and have a custom 2-1/2" or 3" mandrel bent system built for the car.
Since your car is over 5 years old so I would start at the turbo with a 2-1/2" or 3" downpipe and install a high flow cat along with everything else.
Your only other decision is thether you want a stealth exhaust, or if you prefer the rice box coffee can "TUNER" sound. Personally I like stealth. It confuses the competition into thinking you don't have anything under the hood.
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Nathan Valles, Black 855R, Tint
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