For nearly 3 decades, Borla Exhaust has been the choice of Mustang experts, from the Cobra-R SVT Mustang to the new 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®. And, when the ’05 Mustang was first being reviewed, BORLA® was already busy designing an awesome new Cat-Back™ system that bolts behind the factory H-pipe, is lighter than the factory system and includes our famous “S” Style mufflers (PN 140135).