BOLD MAGENTA part numbers are new for 2026 EXHAUST PARTS-UNLIMITED.COM OFFROAD | 2026 EXHAUST 31 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”. STAINLESS STEEL HEADPIPE FOR YAMAHA WR/YZ450F 03-05 •Specially shaped stainless steel headpipe improves performance when compared to stock headers; built from 304 stainless steel to ensure maximum durability and corrosion resistance EXHAUST REPLACEMENT PARTS • Quiet Core and Quiet Tip inserts produce a more subdued exhaust note •End caps offered in a variety of sizes to allow fine-tuning of power delivery for different types of riding and terrain DESCRIPTION PART # EMIS* Stainless steel headpipe 1822-0023 3 DESCRIPTION PART # End cap for 3.5” canister (stainless) (07 and up models) 1861-0476 End cap for 3.5” canister (stainless) (pre-07 models) 1861-0017 End cap for 4.0” canister (stainless) (07 and up models) 1861-0475 End cap for 4.0” canister (stainless) (pre-07 models) 1861-0016 End cap for Ti-5/Ti-6, 4.5”/1.5”, carbon 1860-08111 End cap, Quiet Tip w/ 4” base and 1.5” insert assembly kit (billet) 1861-0312 Insert, 1.50”/4” base (07 models) 1861-0445 DESCRIPTION PART # Insert, 1.625”/4” base (07 models) 1861-0444 Insert, 1.75”/4” base (07 models) 1861-0446 Insert, Quiet, 3.5” base (07 and newer) 1861-0474 Modular Quiet Tip for 3.5” canister 1861-0019 Modular Quiet Tip for 4.0” canister 1861-0020 Spark arrestor screen: fits 3.5” or 4” four-stroke silencers (pre-07 models) 1861-0015 1 Not for dual muffler systems/slip ons. 1861-0017 1861-0015 1861-0020 1861-0475 1860-0811
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