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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20 and N26 Turbo Engine / Drivetrain / Exhaust Modifications > Resonance when up shifting at full acceleration
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      05-21-2013, 04:55 PM   #1
heldraget
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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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      05-21-2013, 05:01 PM   #2
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I'm pretty sure it's meant to be that way, enjoy it
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      05-21-2013, 05:25 PM   #3
heldraget
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It would be easier to enjoy if I knew it's a feature and not a bug
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      05-21-2013, 05:37 PM   #4
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Take an audio recording.
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      05-21-2013, 09:57 PM   #5
Joshhleee
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all the new bmw do that, i personally think it sounds nice
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      05-21-2013, 10:26 PM   #6
1GrayBulldog
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i've got it too with the magnaflow cat-back, and the reverb sound seems to kick in when a shift occurs from 4000rpm or above. definitely agree with the others here that the sound is bad ass...
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      05-21-2013, 11:54 PM   #7
canbmw
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Maybe a heat shield that has come loose or something related to the installation??
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      05-22-2013, 12:10 AM   #8
momo3605
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I have the same thing on mine, I think it's normal. Check out a video of the F10 M5 shifting, it does the same thing.
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      05-22-2013, 05:13 AM   #9
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I got the stock exhaust and hear it when im shifting in D/S, kinda goes hand in hand with the shift-kick you get when accelerating fast and shifting. And with the pano-roof open, its sounds even better unfortunately I havenīt had the time to get the M-Perf exhaust yet.
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      05-22-2013, 08:05 AM   #10
heldraget
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Thanks all, good to hear it's working as supposed!

Funny that I never noticed it with the stock exhaust.
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