Mate, if you want it to sound awesome, and i really mean awesome, just disable the flap yourself!! It will take you 10 min.
The thing is under the rear bumper next to the left wheel. There is a little hose going to the body of it. All i did was i disconnected the hose! Make sure you block the hose and the pump so dirt doesn't get in. I'll take a few photos if you want. The best thing about this is that if you dont like it you can put it back to stock!
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