Hmmm.. well, have you considered getting the GTC system?
Its a valve controlled exhaust system. When the valve is closed, it sounds pretty close like stock and if its wide open, well yea, it drones.... I drove it all the way to vegas like that.. yea.. it was pretty bad.. but you can close the valve and it sounds fine!
Ed Lin
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09AWE90M: Light headlight tint, Full front end clear bra wrap(Harris@InstyleGraphics), Ceramic tint(40%), Piaa GTX H3 bulb, HID 8k AE, 6k Low, INT Luxer1 lights, RD springs, LMR 20X9 +8, 20X10 +18 (Dave @ Status), Vertice CF hood Ducts(Dat @ VertexUSA), Tecnocraft FULL Envy Intake system+plenum(KEVLAR)+cabin filter covers, Meister GTC exhaust, Arkym F LIP.