The more pipe you put on your exhaust, the quieter it will be. My cat back exhaust splits apart between the muffler and the tip just over the axle. I can run just the muffler (as a dump) which is leagle as long as it goes behind the rear axle. When I put my tips on, it actually makes it quieter. It's because the more pipe you have, it will absorbe more sound.
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