The RE 13 draws on over forty years of pipe building experience and knowing how to make raw power. A ground up design unlike any other pipe on the market, the RE 13 stands alone in innovation and performance. The RE 13 is composed of a stainless steel head pipe, mid-pipe, and an aluminum muffler for unmatched performance and extreme durability. Black Out Edition. Unique aluminum muffler shape allows for added volume and clearance. Coned inlet for greater volume. Internal muffler chamber reduces overall sound. TIG welded 304 stainless steel mid-pipe / head pipe. CNC-machined aluminum muffler bracket. Lightweight carbon fiber end tip. Massive horsepower and torque gains. Hand-crafted in the U.S.A.