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Magnaflows or most american brand mufflers=drone issue, plain and simple. Only way to turn it down is with Resonators(definitely wont work in most porsches bec. of the limited space) or replacing your mufflers.
IMO, the more highend european made mufflers are your best bet when you dont want the interior drone issue. I have a BRABUS exhaust with Resonator deleted in my MB E55 and there is absolutely NO drone even with the resonator delete mod.
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