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Resonance when up shifting at full acceleration
A few days ago my dealer installed the M Perf exhaust on my 328i M Sport F31 AT8. Now there's a loud vibration/resonance when up shifting during full acceleration. I've been in Sport+ and used the paddle shifters in manual mode.
The duration is about half a second and it's very loud/strong.
Is this to be expected? Has anyone else experienced this?
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