Quote:
Originally Posted by 2SSummitWhiteSix
I'm curious as to the answer of the OP's original question??? Can anyone speak to the sound of a non NPP muffler delete vs. an NPP open valve sound?
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The muffler delete definitely has more resonance and the noise travels not just only inside the car but outside too. Plus it is a bit more boomy. When I start my car in the garage with the NPP it never shook the house. Now when I do a cold start post muffler delete with NPP it resonates throughout the house and vibrates a little. My fiance claims it is louder when she was tailing me but to me it sounds the same when it comes to WOT.