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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning BMW M Performance Exhaust Flap Actuator Plug Cover

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      04-15-2019, 05:45 PM   #1
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Drives: '17 M240i, AT, BSM
Join Date: Dec 2016
Location: Florida, USA

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BMW M Performance Exhaust Flap Actuator Plug Cover

As I understand it, the function of the exhaust flap is to decrease the time it takes to heat up the cat on cold start and provide some minor sound modification, depending on the drive mode & RPM.
Well, I don't care for, or want any of that, so I've considered doing this since I got the car. I finally got around to it.
I ordered and installed the BMW M Performance Exhaust Flap (Dummy) Actuator Plug Cover. That is the part that comes with the M Performance muffler, which doesn't have a valve. So, when installed it tricks the ECU into thinking the valve is still there and no error code is stored.
I tie-wrapped the wire/plug out of the way and covered the female socket on the valve with electrical tape.
It's an easy job and eliminates the valve, without an error code. It's not a big difference in sound, but I'm glad I did it.
The combination of resonator delete, OE muffler and open valve sounds great and it's the best bang for the buck!

Call me old fashioned, but if I have 2 tail pipes, I want the exhaust to always flow out of both of them.
My 2017 M240i: Dinan Mid-pipe, MP LSD, MP Rear Diffuser, BMS Black Chrome Slant Cut Exhaust Tips, iND painted mirror caps, Smoked Reflectors, 18x8.5 ET38 437M replica wheels

Last edited by PeterWT; 04-15-2019 at 07:49 PM.
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      04-15-2019, 07:00 PM   #2
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Drives: BMW M240i xDrive
Join Date: Mar 2019
Location: Maryland

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I did the same. Then I had one resonator removed and it made a little difference. Then I dropped in the VRSF downpipe and Dinan midpipe (together). When they started it (cold start) in the shop I about had a heart attack! lol
It took a few days before I absolutely loved it!
2017 BMW M240i xDrive - Mission Performance Stage 2 and transmission flash, VRSF 4.5" downpipe, Dinan midpipe, BMW M Performance muffler, Agency Power Cold Air Intake. 11.58 @ 116MPH
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