EXHAUST RS4 SS RZR XP900 This rs-4 full system pulls out all the stops Cnc mandrel bent using 304 stainless steel tubing for a long lasting, durable and rust-resistant lif Headers features a 2-into-1 design, with over-sized step tube design for maximum power through out t Muffler features 304 stainless steel cnc rolled and robot welded canister shell Staying true to the rs-4, this system uses a carbonfiber end-cap, but we have added an embossed yosh