BORLA? X-Pipe 60548 works perfectly between the factory catalytic converters and BORLA? Axle-Back systems on all C7 Corvettes including Stingray, Grand Sport, and Z06 models. This performance X-Pipe creates power while adding a great sound. With adapters it can be used with headers. Fits vehicles With or WITHOUT NPP (dual mode exhaust). Built from premium T-304 austenitic 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.