BOLD MAGENTA part numbers are new for 2024 EXHAUST PARTSCANADA .COM OFFROAD | 2024 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 CRF250R 11-13 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1444 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 KTM 450 SX-F 13-15, SX-F FE 12-14, XCF 13-15 Signature RS-4 Stainless/titanium/carbon fiber 1820-1429 3 SUZUKI RM-Z250 10-18 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1441 3 DR-Z400S/SM 00-24 Signature RS-4 Stainless/aluminum/carbon fiber (dual mufflers) 1810-2249 3 RM-Z450 08-17 Signature RS-4 Stainless/titanium/carbon fiber 1820-1442 3 RMX450Z 10-11 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1442 3 YAMAHA YZ250F 14-18,YZ250FX 15-16,WR250F 15-16 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1812 3 YZ450F 14-17 Signature RS-4 Stainless/aluminum/carbon fiber 1820-1581 3 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 1820-1788 1820-1812 1810-2249 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
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