Designed to provide a long-taper exhaust flow transition from 3 long-tube header collectors to 2.5 exhaust systems. Gasket-less, slip-on design eliminates 3-bolt flange connections to provide optimized ground clearance and maintenance-free service.Used to connect slip-style header collectors to similar sized exhaust system tubing. Provides the lowest profile tubing connection possible; perfect for vehicles that are ground clearance.OE quality O.D. to O.D. connection solution for eliminating 3-bolt header collector gasket.