This bolt-on XDR Competition exhaust system is designed specifically for the 2015-2021 Polaris RZR 900 2 and 4 door models with the naturally aspirated engine, including 900S models, and RZR Trail 900 models. Features include 409S stainless steel construction, a 2.25-inch mandrel-bent inlet tube flowing into the "straight-through" cross-flow XDR Competition muffler that provides a deep moderate to aggressive sound level. The dual 2.25-inch mandrel-bent tailpipes are tucked up high within the rear fenders and are finished off with a pair of 3.50-inch brushed 304s stainless steel tips with black anodized aluminum end caps. The system also comes with a laser-cut heat shield to protect the factory plastic rear valance. Includes all necessary hardware and detailed instructions for a simple at home installation. Note: This system does not include a catalytic converter and therefore is not emissions compliant for on-road or trail use. For Competition use only