YOSHIMURA 12-16 250/350/450/500 MUFFLER
YOSHIMURA 12-16 250/350/450/500 MUFFLER

YOSHIMURA 12-16 250/350/450/500 MUFFLER

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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.

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.
KTM 250 SX F 2011-2015
KTM 350 EXC F 2011-2015
KTM 350 SX F 2011-2015
KTM 350XC F 2014-2015
KTM 450 SX F 2011-2015
KTM 450 XC F 2013-2015
KTM 450 XC W 2012-2015
KTM 500 EXC 2012-2015
KTM 500 XC W 2012-2015
Sound levels at idle speed tested at 1' above and 1' behind each
muffler on the same 21' 500 EXCF tested back to back.

Stock muffler 82
Stock w Pro Moto end cap / ultra silent insert 85
Stock w Pro Moto end cap / silent insert 86
Stock w Pro Moto end cap 88

Graves Motorsports w db killer 85
Graves Motorsports 89

Fmf q4 84
Fmf 4.1 88
Fmf power core 88

Lexx w db killer 86
Lexx w spark arrestor insert 87
Lexx 89

Akropovic 85