i had a 2014 535i x drive with Remus exhaust and sold it. It did Drone like Crazy with High flow downpipe... The best sound on it was with stock mufflers and catless downpipe with some burbles from BM3 tune. Sounded Amazing !!!!!!! and cheaper overall !!!! The 535i F10 is a hard car to get to sound good, but i did it.
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2020 BMW M340ix Dravit Grey
2018 BMW M3 Alpine White
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