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BMW 5-Series (G30) Forum Engine, Exhaust, Drivetrain, Tuning Modifications Decat downpipe

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      12-12-2019, 03:00 AM   #1
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Decat downpipe

Thinking of getting a 4 decat downpipe for my B48.

Does a decat increase exhaust noise levels?
I like how quiet my car is inside.

Also getting a tune, so thought I might do both at the same time
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      12-16-2019, 11:42 AM   #2
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let me know if i can help
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      12-17-2019, 04:17 AM   #3
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let me know if i can help
Does a decat pipe increase exhaust noise levels?
I have heard they can cause a droning in the cabin.

My tuner is looking for a decat. What do you suggest?
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      12-17-2019, 11:25 AM   #4
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Quote:
Originally Posted by Rikes View Post
Does a decat pipe increase exhaust noise levels?
I have heard they can cause a droning in the cabin.

My tuner is looking for a decat. What do you suggest?
Yes downpipe will increase noise. I would not worry about drone with stock exhaust
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      02-05-2020, 02:29 PM   #5
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The sound proofing on the 5 series is extremely good, don't worry about drone at all.
I have a decat on my 540i without resonators (just MPerf muffler) and get 0 drone, so go ahead and do it! It will sound a lot more "alive" but not too loud since the motor will no longer be choked by the cat.
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