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Originally Posted by The Nerd
It'll throw a code though....right? Any other disadvantages why BMW designed this flap to be shut upon start-up that might harm the car if we disable this?
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No codes to my knowledge. I think on the older models it was a different actuator (Pneumatic perhaps) and that put up a code. I've had mine disconnected for a couple months without any dash notifications, but I haven't had it scanned for a code. I guess the worse that could happen is you said it got accidentally unplugged somehow.
As for as why BMW does this? My guess is to keep the noise down when not under full throttle. When you're putting around the flap closes to the exhaust note isn't as loud, but get on it and they both are open. I can't think of any other reason to only use one of the exhausts under partial throttle, but I'm not BMW expert.