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The catalytic converter and SET valve are still the bottleneck in the exhaust system after you drill out your baffles so this will have no effect whatsoever on engine performance, it only results in a moderate increase in sound level.

It still wont sound like an aftermarket exhaust but it is a bit more throaty then stock form. For the cost of a hole saw and 15 minutes of your time this mod is certainly worth it!! :bigthumbsup:
 
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