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So one of my friends has an X5M as well and we used his car for the "Experiment" we did a standard muffler delete but didn't remove the resonators. Did you try the muffler delete before the resonator delete or you did them both at the same time? Reason im asking is because im wondering how big a difference the resonator will make?
Last edited by Sabs1815; 08-14-2017 at 05:07 PM..
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