Quote:
Originally Posted by MagnusT
With ASD delete, can you hear the difference between open and closed exhaust flap?
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Yes, but that's because I have a valve controller. If you leave the valve operation set to auto/stock it's hard to hear any difference at all, let alone knowing when the valve is open or shut.
You can control the valve(s) manually with an app like Bimmerlink or with a valve controller like CG Precision and then you can actually switch between open and shut yourself and listen for differences in volume. It becomes very obvious once you force open/shut them. If they're set to auto you never know what the hell they're doing. They could be partially open or shut for all you know.