Fits vehicles With or WITHOUT AFM Valves and or NPP Valves. BORLA 2.75 diameter Merge 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. 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, they come with the BORLA Million - Mile Warranty