if you want a good mellow sound i would prob go with stillen or invidia gemini and leave the stock cats but if you want it to sound bad A$$ go with F.I, Ark, or Agency Power
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2011 WRX STICobb Accessport, Nameless Performance exhaust, COBB SF Intake, COBB downpipe, 20% tint, Work Emotion XD9's
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