Thanks. I called the guys over at GTHAUS and they said that tunning for their exhaust IS NOT needed in any way shape or form. He gave me a reason but im not able to repeat the jargon that he said 
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Black Rdstr:GTHAUS Meisterschaft FCB.Tint(20%+50% windshield).3"Carb Stub Ant.Z Lisc Plt & LED.Rr fog.VF Fend.Cust Handles.EVO Cust Rdstr Wing.Varrstoen 19" Whls.Stillen HFC&CAI.Swift Spring.VQ37 Cust Mani.Z1 UPREV.Amuse.310whp/254torq
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