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      09-26-2021, 11:24 AM   #1
rozaylex
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Muffler delete or Cat less down pipe

Hi All,
Just got a 2020 M340i and was wondering what is better for sound, pops, burbles, ect.
Should I just do a muffler delete, but take away the valve that switches between modes or just replace the downpipe with a cat less one?
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      09-27-2021, 12:56 AM   #2
mkcobain
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You can simply unplug the plug connected to the flaps when the car is running on sport mode and valve is fully open. Try and see if it is enough for you.
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      09-27-2021, 09:23 AM   #3
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On the recent ones this changes almost nothing
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      10-12-2021, 12:45 PM   #4
EduardoLG
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Quote:
Originally Posted by mkcobain View Post
You can simply unplug the plug connected to the flaps when the car is running on sport mode and valve is fully open. Try and see if it is enough for you.
Do you know how can I do this? I'm assuming it will automatically make it way better sounding even when completely STOCK?
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      10-12-2021, 09:26 PM   #5
v_ckash623
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Quote:
Originally Posted by EduardoLG View Post
Quote:
Originally Posted by mkcobain View Post
You can simply unplug the plug connected to the flaps when the car is running on sport mode and valve is fully open. Try and see if it is enough for you.
Do you know how can I do this? I'm assuming it will automatically make it way better sounding even when completely STOCK?
Car has to be at operating temperature before the flap will open when in sport mode. But, once the flap is open, just park the car, stick your head underneath the passenger side of the bumper, and pull the plug from the valve actuator. You can tuck it up so it's not dragging or collecting dirt. That'll keep the valve open, even in comfort.
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2015 Kia Optima SX Turbo -> 2017 Infiniti Q50 Red Sport AWD -> 2018 BMW 340i xDrive -> 2020 BMW M340i xDrive
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