Product image 1KTM 500/450/350/250 Signature RS-4 SO SS-AL-CF
Product image 2KTM 500/450/350/250 Signature RS-4 SO SS-AL-CF

*Product may vary by application

KTM 500/450/350/250 Signature RS-4 SO SS-AL-CF

SKU: 263502D321

Regular price $415.78


Signature Series Exhaust System


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

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 tail-pipe
  • Repack Kits, optional Inserts and Spark Arresters are available for all models

*FITMENT NOTE: This system fits 350EXC-F and 500EXC only when license plate and turn signals are removed.

Instructions and Parts Diagram
Instructions / Parts Diagram

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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  • KTM 250SX F 2011
  • KTM 250SX F 2012
  • KTM 250SX F 2013
  • KTM 250SX F 2014
  • KTM 250SX F 2015
  • KTM 350EXC F 2011
  • KTM 350EXC F 2012
  • KTM 350EXC F 2013
  • KTM 350EXC F 2014
  • KTM 350EXC F 2015
  • KTM 350SX F 2011
  • KTM 350SX F 2012
  • KTM 350SX F 2013
  • KTM 350SX F 2014
  • KTM 350SX F 2015
  • KTM 350XC F 2014
  • KTM 350XC F 2015
  • KTM 450SX F 2011
  • KTM 450SX F 2012
  • KTM 450SX F 2013
  • KTM 450SX F 2014
  • KTM 450SX F 2015
  • KTM 450XC F 2013
  • KTM 450XC F 2014
  • KTM 450XC F 2015
  • KTM 450XC W 2012
  • KTM 450XC W 2013
  • KTM 450XC W 2014
  • KTM 450XC W 2015
  • KTM 500EXC 2012
  • KTM 500EXC 2013
  • KTM 500EXC 2014
  • KTM 500EXC 2015
  • KTM 500XC W 2012
  • KTM 500XC W 2013
  • KTM 500XC W 2014
  • KTM 500XC W 2015
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