I just bought a second hand GTHAUS system that come off an 2012 JGCSRT that was bought by a dealer I know. Before I bought the system I took the car for a test drive and it sounded like the flaps were open at all times, the wireless remote did not seem to do anything. It sounded amazing so I still bought the system. After reading this post I assume the issue is the motor / grub screw. Carbon6 did the replacement you bought off amazon work well?
Yep, was an easy fix, just a pain. Shouldn't be hard to test the motors before install, just use a flashlight to see if the post is sticking. Also, if the grub screw is out/loose, it will sound like this:
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