Cat-Back Exhaust System - ATAKEXCEPT Convertible. This 3" diameter True Dual Quad Tip BORLA Cat Back system features a Merge X Pipe for increased performance and improved sound. Muffler contains Polyphonic Harmonizer technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full bodied sound. This system features the aggressive ATAK sound with no drone inside the vehicle