Loud Aggressive Sound. Add a touch of Borla excellence to your turbocharged S550 EcoBoost Mustang with an "ATAK" catback exhaust system. A Borla "ATAK" catback system will significantly increase exhaust flow over the restrictive stock exhaust system for a dramatic increase in rear wheel horsepower and an 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. Manufactured from ultra smooth mandrel bent 2.25" diameter T-304 stainless steel tubing to improve exhaust flow, this Borla catback exhaust system includes a Y-pipe and features (2) race inspired "ATAK" mufflers with 4" chromed stainless steel tips that are embossed with the Borla logo for both impressive looks and great sound. Application. This Borla ATAK Cat-Back Exhaust System is designed as a direct bolt on replacement for the 2015-2023 EcoBoost Fastback Mustangs without the Active Valve Exhaust. Not compatible on Convertible models.