{"product_id":"k-n-universal-custom-air-filter-oval-shape-9-313in-od-2-375-height","title":"K\u0026N Universal Custom Air Filter - Oval Shape 9.313in OD \/ 2.375 Height","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003eE-3988\u003c\/span\u003e | \u003cstrong\u003eUPC:\u003c\/strong\u003e 024844366818\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eK\u0026amp;N Universal Custom Air Filter - Oval Shape 9.313in OD \/ 2.375 Height for Harley-Davidson Sportster 2004-2022\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eK\u0026amp;N E-3988 is a washable reusable oval air filter designed as a direct replacement for RK Series air cleaner assemblies on Harley-Davidson Sportster motorcycles from 2004 to 2022. This high-flow filter increases horsepower and acceleration by allowing greater airflow while maintaining strong filtration to protect your engine. Crafted with cotton gauze media and precise dimensions of 9.313in outer diameter 8.25in inner diameter and 2.375in height it fits perfectly in RK-3930 RK-3113 and compatible assemblies.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Airflow Design:\u003c\/strong\u003e Boosts horsepower and rate of acceleration through increased air volume for responsive throttle and quicker rides on Sportster models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptional Filtration:\u003c\/strong\u003e Cotton gauze media traps dirt and debris effectively to safeguard engine components during long rides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWashable and Reusable:\u003c\/strong\u003e Clean with K\u0026amp;N cleaning kit and re-oil for repeated use saving money over disposable filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMillion Mile Limited Warranty:\u003c\/strong\u003e Backed by K\u0026amp;N lifetime guarantee covering defects for peace of mind.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Fit Specifications:\u003c\/strong\u003e Oval shape with 9.313in flange OD 8.25in flange ID 2.375in height and centered rubber flanges drops into RK Series assemblies without modifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePre-oiled and ready to install out of the box.\u003c\/li\u003e\n\u003cli\u003eService every 50000 miles under normal riding conditions or more frequently in dusty environments.\u003c\/li\u003e\n\u003cli\u003eShips in protective box measuring 9.45in x 9.21in x 3.98in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eRemove old filter from RK Series housing and insert E-3988 directly no tools required for most setups.\u003c\/li\u003e\n\u003cli\u003eCompatible with stock RK backing plates and hardware on Sportster models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL883\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL883C Custom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL883L SuperLow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL883N Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL1200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL1200C Custom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL1200N Nightster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL1200R Roadster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL1200T SuperLow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2022\u003c\/td\u003e\n\u003ctd\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd\u003eSportster\u003c\/td\u003e\n\u003ctd\u003eXL1200X Forty-Eight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose K\u0026amp;N?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProven leader in high-performance air filtration for motorcycles since 1969.\u003c\/li\u003e\n\u003cli\u003eEngineered for real-world power gains and engine protection on Harley models.\u003c\/li\u003e\n\u003cli\u003ePrecision-molded rubber flanges ensure airtight seal in RK Series housings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Does E-3988 fit all 2004-2022 Harley Sportster models?\u003cbr\u003e\n \u003cstrong\u003eA:\u003c\/strong\u003e Yes it replaces the filter element in K\u0026amp;N RK Series air cleaners like RK-3930 and RK-3113 used on XL883 and XL1200 Sportster variants confirm your assembly matches the 9.313in OD flange.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What material is used in this filter?\u003cbr\u003e\n \u003cstrong\u003eA:\u003c\/strong\u003e Four-ply cotton gauze pleated media pre-oiled for instant filtration and high airflow oiled cotton traps fine particles better than paper.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What does the warranty cover?\u003cbr\u003e\n \u003cstrong\u003eA:\u003c\/strong\u003e K\u0026amp;N Million Mile Limited Warranty protects against material and workmanship defects when cleaned and re-oiled per instructions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground or USPS Priority\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock - ships same or next business day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Compact box 9.45in x 9.21in x 3.98in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.2 lb (0.5 kg)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K\u0026N Engineering","offers":[{"title":"Default Title","offer_id":40091351613519,"sku":"KNNE-3988","price":68.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/kn-universal-custom-air-filter-oval-shape-9_313in-od-2_375-height-kn-engineering.jpg?v=1766993148","url":"https:\/\/www.blackopsautoworks.com\/products\/k-n-universal-custom-air-filter-oval-shape-9-313in-od-2-375-height","provider":"Black Ops Auto Works","version":"1.0","type":"link"}