13-14 ARCTIC CAT WC1000: Big Gun Evo Utility Slip-On Exhaust The Big Gun Evo Utility Series was designed to deliver raw horsepower and torque gains throughout the RPM range for ATVs and UTVs. Made from 0.049" stainless steel tubing and an aluminum muffler canister, the Big Gun Utility exhaust system is much lighter than stock units. The sleek muffler design also allows for maximum clearance to avoid your exhaust from hitting the rear brake caliper. All EVO Series pipes come in stainless steel, with a CNC bracket, Race Tools packing, and spark arrestor screen. No other pipe on the market will come with these accessories included.