{"product_id":"k-n-rk-3909-1-intake-system-harley-davidson","title":"K\u0026 N RK-3909-1 Intake System-Harley Davidson","description":"\u003cp\u003eK\u0026amp; N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Built around the legendary K\u0026amp; N High-Flow Air Filter, the this RK Series assembly includes an innovative powder coated billet aluminum back plate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDesigned to increase horsepower \u0026amp; torque\u003c\/li\u003e\n\u003cli\u003eDyno-tuned velocity stack\u003c\/li\u003e\n\u003cli\u003eWashable and reusable\u003c\/li\u003e\n\u003cli\u003eExcellent air filtration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Box Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Color:\u003c\/strong\u003e Red\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Height:\u003c\/strong\u003e 1.625 in (41 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Inside Diameter:\u003c\/strong\u003e 6.188 in (157 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Material:\u003c\/strong\u003e Cotton Gauze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Outlet Shape:\u003c\/strong\u003e Not Flanged\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Shape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Filter Washable:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCARB EO Number:\u003c\/strong\u003e D-269-35\/55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamp Color\/Finish:\u003c\/strong\u003e Not Applicable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamp Material:\u003c\/strong\u003e No Clamps Required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamp Style:\u003c\/strong\u003e No Clamps Required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamps Included:\u003c\/strong\u003e No Clamps Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor \/ Finish:\u003c\/strong\u003e Red Filter, Metal Top\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCouplers Included:\u003c\/strong\u003e None\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEstimated Horsepower Gain:\u003c\/strong\u003e 6.05 HP @ 5206 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Diameter:\u003c\/strong\u003e 2.25 in (57 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMass Air Flow Sensor Adapter Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware Included:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Flange:\u003c\/strong\u003e 2.25 in (57 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Included:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 1.688 in (43 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Material:\u003c\/strong\u003e Paperboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Type:\u003c\/strong\u003e Box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Style:\u003c\/strong\u003e Motorcycle Intake System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Filter:\u003c\/strong\u003e E-3972\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 7 Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStreet Legal In All US States:\u003c\/strong\u003e Not legal for sale or use in California on any pollution controlled motor vehicle.  NOTE: Some specific models and years may be legal in CA. Check the CARB status on your parts at knfilters.com.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Oval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Material:\u003c\/strong\u003e Black Powder Coated\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e No-Hassle Lifetime Limited warranty\u003c\/p\u003e","brand":"K\u0026N","offers":[{"title":"Default Title","offer_id":44849827872903,"sku":"KNRK-3909-1","price":453.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4008\/1543\/files\/RK-3909-1.jpg?v=1788268698","url":"https:\/\/checkout.northernperformance.ca\/products\/k-n-rk-3909-1-intake-system-harley-davidson","provider":"Northern Performance","version":"1.0","type":"link"}