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dsad1 · 10-11-2015, 11:12 AM

They are different exhausts, the 640i m sport came with a quieter exhaust than the 650 m sport. The m performance exhaust is supposed to make up for that. Below is a random video I found on you tube.

10-11-2015, 11:12 AM	#2
dsad1 Colonel 1212 Rep 2,404 Posts Drives: car Join Date: Sep 2012 Location: United States iTrader: (0)	They are different exhausts, the 640i m sport came with a quieter exhaust than the 650 m sport. The m performance exhaust is supposed to make up for that. Below is a random video I found on you tube.
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