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Start up exhaust sound
I have a 2017 M240i with a Dinan tune and a Dinan midpipe and a Dinan Muffler. All was good for about a two years then I am having the same issue with the sound at start up. It sounds like the exhaust is hitting the bottom cross over or tattling against something. I am not sure what the problem is either. I have had it back to BMW and they state the pipes are all tight. Let me know if you figure it out and I will do likewise.
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