At DMG Motorsports, we present the Yoshimura RS-4 Header/Canister/End Cap Exhaust System (SS-AL-CF), part number 234820D320 — a race-proven, full exhaust upgrade engineered for the 2018-2019 Yamaha YZ450F (also fitting the 2019 YZ450FX and 2019-2020 WR450F). Built from a durable stainless steel tapered header, a lightweight aluminum canister, and a carbon fiber end cap, this system pairs premium materials with Yoshimura's signature performance engineering. The RS-4 Signature Series full system adds 2.8% more h.p. and 1.4 ft-lb more torque, giving the rider better, more linear throttle response. Proudly made in the USA, this exhaust brings Yoshimura's championship-winning R&D straight to your bike. The system starts right at the engine with a tapered header pipe that optimizes exhaust flow for both efficiency and power output, then routes gas into the pentagonal muffler where the polyresonant chamber tones the exhaust note down and boosts power when you hit the mid and high ranges. Whether you're chasing holeshots or fine-tuning throttle response, this RS-4 system delivers the strength, weight savings, and refined sound that serious riders demand.

Features:

• Stainless steel header, aluminum muffler canister, and carbon fiber end cap construction (SS-AL-CF)
• Pentagonal-shaped muffler sleeve with an aluminum mounting bracket
• Maximized internal volume for improved exhaust flow and power
• Polyresonant duplex chamber design that acts as a muffler-within-a-muffler to reduce noise and save weight
• Two-stage stepped baffle design offering considerable weight reduction over the stock exhaust system
• Spark Arrestor/Sound Insert compatible for trail and race-day flexibility
• Comes with all necessary hardware included for an easy installation
• Fits 2018-2019 Yamaha YZ450F, 2019 YZ450FX, and 2019-2020 WR450F
• Proudly made in the USA

Fitment