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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Wierd noises after installing my downpipe
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      01-14-2021, 12:59 AM   #1
40tlk
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Wierd noises after installing my downpipe

I bought a aftermarket downpipe on eBay cause the vrsf took too long to ship after 3 months I got a refund ridiculous. I noticed recently that after aggressively drive my 440i coupe (b58 motor) on sport plus it has this weird thumping/ dragging sound underneath and since winter hit it just got worse anyone have a idea or dealt with this issue before?
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      01-14-2021, 09:01 AM   #2
njdangelo
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exhaust leak from the coupler? is it rhythmic? can you post a video? have you done a visual inspection?
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      01-14-2021, 09:44 AM   #3
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I had a similar issue with a different DP. Make sure the mid pipe is in all the way and strait to keep everything tucked in as far a possible. What I had to do was flatten the metal plate underneath right in the area of the DP. haven't had the issue since. It's possible that it's hitting the plate
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