Yoshimura Yamaha YZ450F 14-17 RS4 Exhaust System Suitable for: Yamaha YZ450F 2014 Yamaha YZ450F 2015 Yamaha YZ450F 2016 Yamaha YZ450F 2017 The work that went into developing the RS-4 muffler has paid big dividends in Off-road Racing; winning multiple Supercross and Motocross titles since it’s inception. We’ve developed the current generation RS-4 based on that research & development, and the result is a unique design that provides an unrivaled combination of power and quiet exhaust tone. The RS-4 features a Polyresonant duplex chamber and two-staged stepped baffle for increased performance, while a carbon cone end cap finishes off its innovative styling. Pentagonal-shaped sleeve Front muffler cap functions as a polyresonant chamber which helps reduce noise Two-stage stepped baffle Carbon fiber end-cap Stainless steel header and tail-pipe Repack Kits, optional Inserts and Spark Arresters are available for all models Introducing Signature Series by Yoshimura – an offering of exhaust systems that a dealer can install with confidence. Our Signature Series lineup is the answer for today’s dealer who is faced with a challenging marketplace. The applications for the Signature Series line cover the entire powersports spectrum, including many of our off-road applications. Everyone of our Championship Winning Motocross exhaust systems and nearly all of out ATV/Side-by-Side applications are all members of the Signature Series Family. All Signature Series components are tested, documented, and marked as required by federal and state regulations.
