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devondragon · 02-01-2019, 09:49 AM

The button also impacts ASD. AFAIk in "efficiency mode" which I assume you mean Comfort engine mode?, the valves are closed by default and the button just turns on and off ASD, which would make things sound quieter/louder inside the car.

02-01-2019, 09:49 AM	#43
devondragon Lieutenant 153 Rep 427 Posts Drives: 2019 M5 Competition Join Date: Oct 2011 Location: Boulder, CO iTrader: (0) Garage List 2014 BMW M6 Coupe [8.50]	The button also impacts ASD. AFAIk in "efficiency mode" which I assume you mean Comfort engine mode?, the valves are closed by default and the button just turns on and off ASD, which would make things sound quieter/louder inside the car.
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