Update: I played around with the arm on the wireless kit. When the arm was shortest (closest to the car), the car wasn't very loud+I had loud resonation when in red mode.
With the arm in the longest position (towards tail pipes), it was at loudest in red mode, but I had to shorten the length a bit because the flap would resonate when in white mode.
I think I found a sweet spot where I don't get any resonation noise... BUT the car is still very quiet on downshifts. I'm wondering if it's because I added dynamat to that drone area inside the trunk? Made it too quiet inside the cabin now? Also, I have stock airbox... I wonder if it's a restriction? No idea how the car sounds outside... I'd have to trust someone to drive my baby