BOLD MAGENTA part numbers are new for 2026 EXHAUST PARTSCANADA .COM OFFROAD | 2026 EXHAUST 35 DISCLAIMER: *EMIS (EMISSIONS CATEGORIZATION CODE). SEE PAGES 4-6 FOR CATEGORY CODES, IMPORTANT EPA/CARB EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND NOTICE REGARDING NOISE REGULATIONS. PRODUCTS NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES IF NOT CATEGORIZED AS “1” OR “4”. SYSTEMS FITS MODEL SERIES MUFFLER TYPE HEADER/MUFFLER/END CAP TYPE PART # EMIS* HONDA CRF250L/Rally 17-20 Race RS-4 Stainless/stainless/carbon fiber 1820-1787 3 CRF450X 19-24 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1886 3 KAWASAKI KX250F 17-20 Signature RS-4 Stainless/stainless/carbon fiber 1820-1788 3 SUZUKI DR-Z400S/SM 00-24 Signature RS-4 Stainless/aluminum/carbon fiber (Dual) 1810-2249 3 RMX450Z 10-11 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1442 3 RM-Z450 08-17 Signature RS-4 Stainless/titanium/carbon fiber 1820-1442 3 YAMAHA YZ450F 18-19 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1804 3 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 RS-4 EXHAUST SYSTEMS AND SLIP-ON MUFFLERS continued on next page. •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 33 for an explanation of Yoshimura exhaust series types 1820-1788 1810-2249
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