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I purchased an OBX 4-2-1 header and and OBX high flow cat and of course an OBX muffler and 3in piping all the way out. i gained 12.2hp over baseline(i had stock exhaust header and cat with a flowmaster and twin loop muffler before,that came with the car when i bought it. Of course my motor isn't stock at all though. many upgrade were required to help them make my exhaust that much of a difference. over all very pleased. so for my next project i know im going with OBX again. KEEP UP THE GREAT WORK OBX
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