Borla 21-23 Ford Raptor 3in Atak Mid Section Connection PipeBorla 21 23 Ford Raptor 3in Atak Mid Section Connection Pipe BORLA system is a True Dual design. This BORLA mid pipe assembly was designed specifially for the F 150 Raptor. It features the ATAK sound level, our most aggressive sound. It provides a more exciting driving experience without any drone. System contains four of BORLA'S unique Polyphonic Harmonizer technology that tilizes patented units that contain pipes of different diameters and lengths