I've also installed an Exhaust Flap Control Module.
I'm VERY picky. I didn't want to have an extra remote to control my exhaust flaps, I wanted a way to control the flaps via the Audi Drive Select Menu.
I finally found what I was looking for.
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Overview of what this does -
Plugs into the CEM in the passenger side footwell.
Comfort - valves closed up until 4800rpm WOT (to protect engine)
Auto - Auto
Dynamic - FULL open at ALL rpm's
Individual - will follow whatever setting you set to above.
Cold start - valves will REMAIN closed UNLESS you switch it to dynamic. (Unlike OEM where it tests the valves open/close upon starting the car and you cannot open the valves by switching to dynamic)
Warm start - you will still get the crackles on start up and then the flaps will revert to closed position.
OH and if you're in comfort but want valves OPEN - switch traction control OFF/ON and the valves will open.
If you've done the above and then cycle the drive select modes and revert to comfort the valves will return to closed. It won't remember the valves open setting in comfort which is good.
Really really well thought out bit of kit. No error codes on VCDS either, it just works.