Borla 19-21 Genesis G70 3.3L V6 Twin Turbo S-type Cat-Back ExhaustThis 2. 25" diameter True Dual Cat Back system was designed specifically for the 3. 3L G70. It contains a Merge X Pipe for increased performance and improved sound. The system features BORLA'S 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. The mufflers then enhance this sound to the