Xtreme Sound Level Dual Rear Exit GTX2 Polished Pro-Series Vehicle Fitment:2011-2013 Dodge Challenger SRT-8, Auto, 6.4L V8*Automatic transmission ONLY2014-2014 Dodge Challenger SRT, Auto, 6.4L V8*Automatic transmission ONLY +10 HORSE POWER +13 TORQUE +9 %...