Twin Turbo BMW 335i Stage 2 419whp LOUD Backfires

2008 BMW 335i I6 twin turbo n54 Stock Turbos MHD Stage 2 19psi Burger Tuning Cone Intakes VRSF chargepipe Stock downpipes Muffler delete (PE Mod) w 4in tips NGK 9554 spark plugs N55 ignition coils
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