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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications worrisome noise M5 mufflers on 550i
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      12-07-2018, 11:28 PM   #1
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worrisome noise M5 mufflers on 550i

I just had an exhaust shop put M5 mufflers on my 550i. Only mufflers got changed out. It sounds much better than the stock mufflers did but I've discovered a strange noise after accelerating and backing off the pedal. I can't tell if it's a burble or actually the exhaust flexing. It's like a bass thump in the trunk and the longer I drive (the hotter the mufflers get?), the more pronounced it becomes until I can actually feel it in the floorboards of the car. I can't seem to replicate it in park, the car has to be moving. It only happens when I mash the pedal and get up past 3K rpms and then let it decelerate. I hear/feel the noise on deceleration like it might be an exhaust burble. I can barely hear it in Comfort Mode for some reason. It's really pronounced in Sport mode. That might just be the higher rpms. I don't know that much about exhaust systems and I'm worried that this sound isn't normal and maybe the exhaust is flexing on a brace or something and causing the sound. Or maybe it's normal? Has anyone else ever experienced something like this?
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      12-08-2018, 03:18 AM   #2
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I have m5 mufflers and wouldn't say I have experienced what you have described....
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      12-08-2018, 09:20 AM   #3
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Have your tech check it out to assure proper installation. Doesn't sound like it's loose but as the muffler heats up it may have shifted. I've experienced this on a couple of muffler installs and it was a fitment issue. A little bending and pulling worked especially when it rained. Rattled like crazy when it got soaking wet. Different situation but might point you in the right direction.
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      12-08-2018, 03:37 PM   #4
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So I had a different shop check it out today and they say everything is tight. They suspect it's something in the a muffler like a blown baffle. Not sure where to go from here. I'm doing research on what could make a muffler make bumping noises internally. I'm only finding info about rattling
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