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I went in with my muffler delete and no problems. And if you add some proper parts to your n55 stock exhaust you'll love it. I've had vanguard dinan rsd vavletronic and this has been my favorite set up. Vibrant resonators + side branched + 3inch muffler delete = no barely any drone and still sounds beasty. Less drone than my vanguard definitely. Plus I have downpipes.
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