check this out
basically a muffler delete but keeping the quad setup...
Edit: Dont know if the hartage quad and the iCarbon have the same positioning for the pipes. Might have to do some research on that...
2008 AW/BL 135ill
Mods: JB4 G5 ISO, 2Step, Raceland DPs,Turbo Back Straight Pipes, BMS DCI, ER CP, HKS BOV, CM10 + CM14 METH, P3 Vent Gauge
Dragstrip: 1.81 60ft 12.2@113 NO METH