{"product_id":"dna-stage-2-air-box-cover-yamaha-xt-660-r-x-2004-15","title":"DNA Stage 2 Air Box Cover | Yamaha XT 660 (R\/X) 2004-15","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\n\u003cp\u003eImprove intake airflow and performance potential on your \u003cstrong\u003eYamaha XT660 R \/ X\u003c\/strong\u003e with the \u003cstrong\u003eDNA Stage 2 Air Box Cover\u003c\/strong\u003e, designed to increase airflow without replacing the complete factory airbox. Featuring DNA's advanced FCd (Full Contour Design) filtration technology, this Stage 2 upgrade replaces part of the original airbox assembly to reduce intake restriction and allow the engine to breathe more freely. With a \u003cstrong\u003e98–99% filtration efficiency\u003c\/strong\u003e, it combines high-flow intake performance with effective protection against airborne contaminants. Developed primarily for race and track applications, the DNA Stage 2 Air Box Cover offers greater tuning potential than a conventional replacement air filter, particularly when combined with suitable fuelling adjustments. Its motorcycle-specific design retains the original airbox layout while providing a practical solution for riders seeking improved throttle response and engine performance.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:30px;\"\u003eCompatible Models\u003c\/h3\u003e\n\n\u003cp\u003e· Yamaha XT660 R (2004-2015)\u003cbr\u003e\n· Yamaha XT660 X (2004-2015)\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:30px;\"\u003eKey Features \u0026amp; Specifications\u003c\/h3\u003e\n\n\u003cdiv style=\"width:100%; overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%; border:none; border-collapse:collapse; border-spacing:0; table-layout:auto; text-align:left;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eFilter Design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003eDNA Advanced FCd (Full Contour Design)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eFiltration Efficiency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003e98–99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eOE Airbox Reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003e5VK-E441E-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eEngine Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003e660 cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003eDirect Airbox Cover Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eFilter Use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003eRace and Track\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:42%; padding:7px 12px 7px 0; border:none; white-space:nowrap; vertical-align:top;\"\u003e\u003cstrong\u003eFuelling\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:7px 0; border:none; vertical-align:top;\"\u003eECU \/ Fuel Recalibration Strongly Recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"margin-top:30px;\"\u003eWhat's Included?\u003c\/h3\u003e\n\n\u003cp\u003e· DNA Stage 2 Air Box Cover – Yamaha XT660 R \/ X\u003cbr\u003e\n· Integrated High-Flow Filter Element\u003cbr\u003e\n· Fitting Guidance\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:30px;\"\u003eAssembly Instructions and Warnings\u003c\/h3\u003e\n\n\u003cp\u003e· Install following the appropriate Yamaha workshop guidance and supplied fitting information.\u003cbr\u003e\n· Remove the relevant original airbox component and fit the DNA Stage 2 Air Box Cover securely.\u003cbr\u003e\n· Ensure the cover is correctly positioned and sealed before operating the motorcycle.\u003cbr\u003e\n· ECU or fuel system recalibration is strongly recommended to accommodate the increased airflow and maintain correct fuelling.\u003cbr\u003e\n· Intended primarily for race and track use; road legality depends on applicable local regulations.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:30px;\"\u003eWhy Choose the DNA Stage 2 Air Box Cover?\u003c\/h3\u003e\n\n\u003cp\u003e· \u003cstrong\u003eIncreased Intake Airflow:\u003c\/strong\u003e Reduces restriction within the original airbox arrangement, allowing greater airflow and improved engine breathing.\u003cbr\u003e\n· \u003cstrong\u003eAdvanced FCd Filtration Technology:\u003c\/strong\u003e DNA's Full Contour Design combines efficient airflow with 98–99% filtration efficiency for effective engine protection.\u003cbr\u003e\n· \u003cstrong\u003eGreater Tuning Potential:\u003c\/strong\u003e Provides additional intake capacity for performance-focused setups, particularly when combined with appropriate fuelling adjustments.\u003cbr\u003e\n· \u003cstrong\u003eMotorcycle-Specific Installation:\u003c\/strong\u003e Designed for the Yamaha XT660 R and X, retaining the factory airbox layout without requiring a complete replacement intake system.\u003c\/p\u003e","brand":"DNA","offers":[{"title":"Default Title","offer_id":39768091295802,"sku":"P-Y6E04-S2","price":83.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0548\/9452\/6522\/files\/P-Y6E04-S2.jpg?v=1793965287","url":"https:\/\/motorcycleperformancestore.co.uk\/products\/dna-stage-2-air-box-cover-yamaha-xt-660-r-x-2004-15","provider":"Motorcycle Performance Store","version":"1.0","type":"link"}