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 to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound. The result is an aggressive custom sound and improved power. System has Active Exhaust Valves. It fits with either the O.E. Tail Pipes or Borla Tail Pipes 60627BC or 60627CFBA. Built from premium T-304 stainless steel, superior to T-400 series (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA stands behind every Connecting Pipe assembly with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.