DG Performance 06-5545 - RCM Alloy Exhaust (Brushed Aluminum) for Polaris Scrambler 500 4X4 (1997-2007 ) RCM Alloy Exhaust with Head Pipe DG exhaust pipes increase Power & Torque The Alloy RCM is similar to our Steel RCM with the exception that the muffler and RCM section is aluminum. This gives makes the Alloy RCM lighter. The headpipe is black and the muffler body is polished aluminum.