The WR EVO downpipe replaces your undersized factory exhaust downpipe in favor of a full 76mm (3") downpipe. The weapon rdownpipe is one of the largest on the market. Made of 304 Stainless steel it features CNC machine mandrel bending which clears the factory lower arm bars. TIG welded, with the ever important CNC machined upper flange that is critical for proper seating of the stock donut gasket. Thisdownpipe yields about a 8-10HP gain on a mildly modified vehicle.