Just buy a AA midpipe. Its good for 10-15 HP and it gets rid of the rasp and increases overall volume about 20%.
I also added Wagners's 200CEL HFC's and that also increased the volume even more. Probably a total of 40-50% louder with the flaps open in Sport +
In comfort mode with the exhaust flaps open its perfect for highway or stealth driving. In Sport, or Sport + it really opens up!
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