BOLD MAGENTA part numbers are new for 2026 FUEL/AIR SYSTEMS PARTS-UNLIMITED.COM STREET | 2026 FUEL/AIR SYSTEMS 1513 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”. UNIVERSAL OVAL STRAIGHT OVAL. DIM. LENGTH FLANGE POSITION PART # 1 3/4” ID (44 MM) 3” x 4”, 2 1/2” x 3 1/2” 2 3/4” Offset RU-2450 2” ID (51 MM) 3” x 4”, 2 1/2” x 3 1/2” 2 3/4” Offset RU-1820 OVAL. DIM. LENGTH FLANGE POSITION PART # 2 7/16” ID (62 MM) 3 3/4” x 4 1/2” 7” Angled 20° RU-139 UNIVERSAL ROUND STRAIGHT TYPE OVERALL DIMENSION LENGTH FLANGE POSITION PART # 1 11/16” ID (43 MM) 3” 5” Centered RU-0210 1 7/8” ID (48 MM) 3” 4” Angled 10° RU-128 2 11/16” ID (52 MM) 3 1/2” 4” Centered RU-50 2 1/4” ID (57 MM) 3 1/2” 4” Centered RU-60 3 1/2” 6” Centered RU-62 3 1/2” 6” Angled 10° RU-109 3 1/2” 4” Angled 20° RU-170 3 1/2” 5” Angled 20° RU-171 3 1/2” 6” Angled 20° RU-172 2 7/16” ID (62 MM) 3 1/2” 4” Centered RU-80 3 1/2” 5” Centered RU-81 3 1/2” 6” Centered RU-82 OVERALL DIMENSION LENGTH FLANGE POSITION PART # 2 7/16” ID (62 MM) (CONT) 3 3/4” 4” Angled 20°/2” lg. RU-175 3 3/4” 5” Angled 20°/2” lg. RU-176 3 3/4” 6” Angled 20°/2” lg. RU-177 2 1/2” ID (63.5 MM) 3 1/2” 4” Angled 5° RB-70 3 1/2” 5” Centered 1011-1583 2 3/4” ID (70 MM) 4” 5” Angled 10° RU-146 4” 7” Angled 10° RU-148 2 7/8” ID (73 MM) 4” 6” Centered RU-162 3” ID (76 MM) 4 1/2” 4” Angled 5° RB-0900 4 1/2” 5” Angled 5° RB-0910 5” 5” Centered RU-2430 UNIVERSAL ROUND TAPERED TYPE MOUNTING FLANGE ID END CAP SIZE FILTER LENGTH FLANGE POSITION PART # 1 3/8” (35 mm) 2” x 2 1/2” 2 1/4” Centered RC-79 1 9/16” (40 mm) 2” x 3” 3” Centered RC-231 1 11/16” (43 mm) 2” x 3” 2 3/4” Centered RC-107 1 7/8” (48 mm) 2” x 3” 3” Centered RC-109 1 15/16” (49 mm) 2” x 3” 3” Centered RC-106 2 1/16” (52.5 mm) 2” x 3 1/2” 4” Centered RC-120 2 1/8” (55 mm) 2” x 3” 3” Centered RC-233 2 1/8” (55 mm) 2” x 3” 2 3/4” Centered RC-234 2 1/4” (57 mm) 2” x 3 1/2” 4” Centered RC-125 UNIVERSAL CLAMP-ON AIR FILTERS •K&N® universal air filters come in three styles – round straight, round tapered and oval straight •All round straight types have rubber end caps •All round tapered types have chrome end caps •All clamp directly to the carburetor throat, replacing the stock airbox and filter element •Match the OD of your carb throat with the ID of the filter (given in inches and millimeters) 1011-1583 RC-234 RU-171 RU-2450
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