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It's interesting because I don't notice a difference in exhaust tone whether the flap is open or closed. Maybe just a little bit more burble when decelerating in 1st in a parking garage with the windows down.
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2015 335i RWD Auto mSport with AFE Valved Axleback, AFE performance Midpipe (with resonator), Injen Intake and JB4 with Bluetooth Connect kit.
VSRF charge pipes, VSRF Intercooler and VSRF Catted Downpipe going on in July.
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