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The stock exhaust + headers usually sounds pretty raspy. Not sure why, has to do with the OEM muffler design I guess. Adding an aftermarket exhaust usually gets rid of that raspy sound as long as it has large enough mufflers.
Also, just incase, make sure you have everything tightened down properly and don't have any exhaust leaks. It's easy to forget to tighten up a bolt or two.
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