Borla Atak Cat Back ExhaustThe 2. 75" BORLA Cat Back system for the Civic Type R contains an Active Exhaust Valve that allow your vehicle to retain the factory designed valve operation. System also 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 to the BORLA mufflers. The mufflers then enhance this