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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > 428i stock exhaust bypass mod
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      01-20-2022, 02:28 PM   #1
adhf36
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Has anyone tried something like this? If so how were the outcomes ? How much louder could this be?

Would like a louder exhaust and to have some control of the exhaust volume without having to pay 2k for a valved cat back system.

Any insight from someone more knowledgeable than me on this would be appreciated.

Thanks!
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      01-21-2022, 08:07 AM   #2
MaverickCruise
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I tried it, and it was like this after I remodeled it,and sounds very loud
The stock exhaust pipe is 1 way in and 2 way out. One of them passes through the silencer, which is not directly penetrated, and the pipe have drilled holes to silence。
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