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vwobgyn
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I have personally installed many AWE exhausts. Their workmanship is top-notch. Each system is personalized for the owner with a custom made name plate as well. The sound of their exhaust on the 997 c4 3.6 was incredible. As for power gains. It was noticeable in the seat of the pants dyno. That's more than 4 HP. The 997 kit I installed was headers, cats, and mufflers. I have also installed their exhaust on the new Cayman. Along with a set of Fabspeed headers, the car made 300Hp at the wheels and sounded very much like an early aircooled Porsche, which it should.