005-4260405-S1 Two Brothers Racing S1R Cat-Eliminating Slip on Exhaust for the 2015-2023 Yamaha R1.  Features a carbon fiber canister and ....lots of fun to be had! Fits: 2015-2024 Yamaha R1 / R1M / R1S (2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024) Fuel remapping not required (although recommended). Includes everything to install: Carbon Fiber Canister Stainless Steel S-bend (Cat Eliminator) with dual O2 sensor bungs Muffler Clamp and Mounting Hardware! The S1R exhaust is the latest state-of-the-art product from Two Brothers Racing. The system features carbon fiber highlighted by a natural finished Aluminum outlet and stamped spring-mounted inlet for ultimate durability. The S1R exhaust from Two Brothers Racing showcases a race design while increasing all-around performance. All of our carbon parts are made with a high temp aerospace grade epoxy resin. The carbon fabric is made with a 33 million modulus carbon tow then impregnated with the high temperature resin under very tight tolerances. Aerospace high-temp carbon fiber Teflon coated magnesium end-cap Stamped spring-fit inlet Aluminum CNC Machined outlet Rubber-lined styled mount Spiral-wound perforated core Accepts sound reduction tips