Borla(r) connection pipe with resonator 60558 works perfectly between the factory catalytic converter and Borla(r) Axle-Back systems on all C7 Corvettes including Stingray Grand Sport and ZO6 models. With adapters it can be used with headers. Fits vehicles With or WITHOUT NPP (dual mode exhaust). Resonator contains internal H-Pipe for increased performance and improved sound. Built from premium high-quality T-304 austenitic stainless steel superior to T-400 series knockoffs (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.