EXHAUST
1820-1788
1820-1302
RS-4 EXHAUST SYSTEMS AND SLIP-ON MUFFLERS
  • Delivers huge power at a very light weight
  • Offers better handling thanks to a lower centralized mass coefficient
  • Uniquely-styled pentagonal muffler body with a carbon fiber cone end cap
  • Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power
  • Two-staged, stepped baffle
  • Tapered headpipe delivers optimal flow and performance
  • Titanium systems include non-spark-arrested 99 dB motocross insert (unless noted)
  • Mufflers available with glossy carbon fiber, satin titanium or brushed aluminum sleeve
  • Stainless systems come with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box
  • Available in Signature, Enduro and Race types, please see page 38 for an explanation of Yoshimura exhaust series types
  • RS-4D EXHAUST SYSTEMS AND SLIP-ON MUFFLERS
  • Championship-winning exhaust system from Yoshimura
  • Dual internal baffle design increases exhaust outflow for improved throttle control and smoother power delivery
  • Boosts horsepower throughout the power curve, especially at the low- and mid-range rpms where riders and racers need it the most
  • Full titanium header pipe
  • Muffler sleeve is glossy carbon fiber or titanium with dual-outlet carbon fiber end cap
  • Titanium muffler has AMA-legal sound inserts installed
  • All necessary hardware for installation included
  • Available in Signature type, please see page 38 for an explanation of Yoshimura exhaust series types
  • SYSTEMS
    FITS MODEL
    SERIES
    MUFFLER TYPE
    HEADER/ MUFFLER/ END CAP TYPE
    P ART  #
    SUG. RETAIL
    HONDA
    CRF250L 13-16
    Race
    RS-4
    Stainless/ stainless/ carbon fiber
    1820-1638
    $579.00
    CRF250L/ Rally 17
    Race
    RS-4
    Stainless/ stainless/ carbon fiber
    1820-1787
    609.00
    CRF250R 10
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1443
    639.00
    CRF250R 11-13
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1444
    639.00
    Signature
    RS-4
    Titanium/ titanium/ carbon fiber
    1820-1239
    945.00
    CRF450R 11-12
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1446
    639.00
    Signature
    RS-4D
    Titanium/ titanium/ carbon fiber
    1820-1302
    1,094.95
    HUSQVARNA
    FC250 16-17
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1747
    639.00
    FC350 16-17
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1747
    639.00
    KAWASAKI
    KX250F 10-16
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1449
    639.00
    KX250F 17-18
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1712
    639.00
    KX250F 17-18
    Signature
    RS-4
    Stainless/ stainless/ carbon fiber
    1820-1788
    639.00
    KX450F 09-15
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1450
    639.00
    KX450F 16-17
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1676
    639.00
    KTM
    250 SXF 13-15
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1454
    675.00
    250 SXF Factory 15, 250 SXF 16-17
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1747
    639.00
    250 XC-F 16-17
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1747
    639.00
    350 SXF 11-12/ EXC-F 11-13 (EXC-F requires turn signal relocation/ removal)
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1452
    675.00
    350 SXF 13-15/ XCF 14-15
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1482
    675.00
    350 SXF 16-17, 350 XC-F 16-17
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1747
    639.00
    450 SXF 13-15, S`XF FE 12-14, XCF 13-15
    Signature
    RS-4
    Stainless/ titanium/ carbon fiber
    1820-1429
    675.00
    SUZUKI
    RM-Z250 10-17
    Signature
    RS-4
    Titanium/ carbon fiber/ carbon fiber
    1820-1219
    995.00
    Signature
    RS-4
    Stainless/ aluminum/ carbon fiber
    1820-1441
    639.00
    RM-Z450 08-17
    Signature
    RS-4
    Stainless/ titanium/ carbon fiber
    1820-1442
    639.00
    RS-4 EXHAUST SYSTEMS AND SLIP-ON MUFFLERS continued on next page.
    DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES.
    SEE PAGE 4 FOR IMPORTANT EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND WARRANTY INFORMATION.
    2018 PARTS UNLIMITED OFFROAD