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I recently discovered this as well. I had a single mid pipe installed and was wondering why it was louder in 1st and 2nd gear and then quieter in 3rd gear and up. Turns out the valves close when you hit 3rd gear unless you give it lots of throttle like others have said. I ended up unplugging my flaps again so that I get the same tone throughout.
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2016 M3 6MT, Yas Marina Blue/Silverstone - Sold
2023 X3M Competition, Brooklyn Grey
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