Borla 16-17 Focus RS Turbocharged 2.3L Single Split Exit ATAK Catback ExhaustBorla 16 17 Focus RS Turbocharged 2. 3L Single Split Exit ATAK Catback Exhaust This system is equipped with a "Sound Suppressing Valve" simulator which ELIMINATES the valve. This avoids any warning lights on the dash while providing maximum flow at all times. System features Boryla's Polyphonic Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to