Borla Attak mufflers for 2011 Mustang GT - used - very good condition - aggressive sound they call them...aka LOUD, crackle, LOUD - no drone at all - would consider trade for Borla Touring mufflers or similar Loud Aggressive Sound. Add a touch of Borla excellence to your new 5.0 GT Mustang with an "ATAK" Axle-back exhaust system for an extremely aggressive muscle car sound that is not for the faint of heart. ATAK. Acoustically-Tuned Applied Kinetics, is Borla's newest technology that produces the highest available dB (decibel) levels to pump the volume while retaining clarity of sound, avoiding distortion typically found in louder exhausts. High Quality Construction. Constructed from ultra smooth mandrel bent 2.75" stainless steel tubing to improve exhaust flow the Borla Axle-back exhaust system features two race inspired "ATAK" mufflers with 4.5 inch polished stainless steel slant tips for aggressive sound and impressive looks. Application. This Borla Stainless Steel exhaust system is specifically designed to be a direct bolt on upgrade reusing factory hardware for the 2011-2012 5.0L GT and 2012 BOSS 302 Mustangs. by Balgonie