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      02-13-2020, 11:22 AM   #8
DoofyTheNut
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Drives: 2014 X1 xDrive35i M-Sport
Join Date: Oct 2018
Location: North Carolina

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Quote:
Originally Posted by Jonathan0880 View Post
Rear exhaust flap? this is in the stock muffler? Would that not effect compression ratio's during rev out?
The rear exhaust flap located in the muffler will not affect anything in the car. It’s commonly referred to as a “golf tee mod” to actually disable it without removing the muffler. I am going to try to upload my first video of it revving, although it’s not terribly great. I might see if I can get another video later today maybe.
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