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Product image 1YZ450F/WR450F 19-21 RS-4 Stainless Slip-On Exhaust, w/ Aluminum Muffler
Product image 2YZ450F/WR450F 19-21 RS-4 Stainless Slip-On Exhaust, w/ Aluminum Muffler
Product image 3YZ450F/WR450F 19-21 RS-4 Stainless Slip-On Exhaust, w/ Aluminum Muffler
Product image 4YZ450F/WR450F 19-21 RS-4 Stainless Slip-On Exhaust, w/ Aluminum Muffler

*Product may vary by application

YZ450F/WR450F 19-21 RS-4 Stainless Slip-On Exhaust, w/ Aluminum Muffler

SKU: 234832D320

Regular price $499.00

MADE IN USA

Signature Series Exhaust System


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Same day shipping on In Stock items placed Mon-Fri by 4:00 pm PST.

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Emissions Compliance Declaration: QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART"


WARNING: Cancer and Reproductive harm - www.p65warnings.ca.gov


The 2020 Yamaha YZ450F has undergone significant changes in both motor and chassis refinements, and seems to be the 450 that many are choosing.

It's no secret that the Yamaha YZ450F has a very good stock system that many of our competitors can't beat. We spent a lot of R&D time in the dyno room and track to create our RS-4 Signature Series to what we think is the best aftermarket exhaust for the new YZ.

Proudly made in the USA!

  • Pentagonal-shaped sleeve
  • Front muffler cap functions as a poly-resonant chamber which helps reduce noise
  • Two-stage stepped baffle
  • Carbon fiber end-cap
  • Stainless steel tail-pipe
  • Repack Kits, optional Inserts and Spark Arresters are available for all models
Instructions and Parts Diagram
Instructions / Parts Diagram

This product was designed to fit on a standard equipped motorcycle, as delivered from the factory. OE and Aftermarket accessories not found on a bike as delivered from the factory, may not be compatible with this product.

Attention International Customers: This product was designed and tested to be compatible with vehicles in the U.S. marketplace only. Compatibility including fitment and performance may vary by marketplace.

Signature Series Exhaust System

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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.

Vehicle Fitment

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  • Yamaha WR450F 2019
  • Yamaha WR450F 2020
  • Yamaha YZ450F 2020
  • Yamaha YZ450F 2021
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