Borla 05-09 Mustang GT 4.6L V8 SS Aggressive Exhaust (rear section only)For over 4 decades, BORLA Exhaust has been the choice of Mustang experts, from the Cobra R SVT Mustang to the Ford GT. Major players in the racing industry and leading tuners from Roush, Steeda, Saleen and Ford Racing to the Shelby 427 Cobra have relied on BORLA. This awesome 2. 5" diameter BORLA Axle Back system bolts on, is lighter than the factory system, includes our famous S Type mufflers with outstanding flow numbers that generate great power