Installation REQUIRES cutting the Original Equipment (O.E.) exhaust system. Cut and clamp behind the secondary catalytic converters. Fits vehicles with or without AFM valves and / or NPP valves (dual mode exhaust). The BORLAÂ 60548 X- Pipe works perfectly between the factory catalytic converters and BORLAÂ Axle-Back systems on all C7 Corvettes including Stingray Grand Sport and Z06 models. When combined with an Axle-Back system it creates a Cat-Backâ„¢ System. This 2.75" diameter performance Merge X-Pipe creates power while adding a great sound. 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. Best of all it comes with the BORLAÂ Million Mile Warranty.