{"product_id":"kartboy-aluminum-crank-pulley-ej-for-alternator-belt-w-ac-pump-delete","title":"Kartboy Aluminum Crank Pulley EJ for Alternator Belt w\/AC Pump Delete","description":"\u003cdiv\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003eKB-050-EJ-S\u003c\/span\u003e\n\u003c\/div\u003e\n\u003ch4\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/h4\u003e\n\u003ch4\u003e\u003cstrong\u003eKartboy Aluminum Crank Pulley EJ Engines - Alternator Belt with A\/C Pump Delete\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe \u003cstrong\u003eKartboy KB-050-EJ-S\u003c\/strong\u003e Aluminum Crank Pulley is the best lightweight underdrive pulley upgrade for Subaru EJ engines (EJ20\/EJ25) with alternator belt drive and A\/C pump delete setups. CNC-machined from high-grade billet aluminum, this pulley reduces rotational mass for quicker throttle response, faster revs, and small horsepower\/torque gains while eliminating the A\/C compressor load – ideal for track-focused WRX\/STI, Legacy GT, Forester XT, or any EJ-series build where maximum performance and reduced parasitic drag matter, without retaining air conditioning.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Billet Aluminum:\u003c\/strong\u003e Significantly reduces rotational inertia over stock pulley – quicker engine response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA\/C Pump Delete Design:\u003c\/strong\u003e Eliminates A\/C compressor belt load for freed-up horsepower and cleaner engine bay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternator Belt Compatible:\u003c\/strong\u003e Maintains alternator function with dedicated belt path – no electrical issues\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision CNC Machining:\u003c\/strong\u003e Perfect balance and fitment anodized finish for corrosion resistance and style\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On Fit:\u003c\/strong\u003e Uses factory crank bolt and timing marks no modifications required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKartboy Quality:\u003c\/strong\u003e Trusted Subaru performance brand reliable for street and track EJ builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable width=\"100%\" cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eKB-050-EJ-S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBillet Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eAnodized (Silver \/ Black Options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eSubaru EJ Engines (EJ20\/EJ25) with Alternator Belt \u0026amp; A\/C Delete\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eDirect Bolt-On (Uses Factory Crank Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited (Kartboy)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003eApprox. 2-3 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eA\/C delete pulley – removes compressor load for performance gains (A\/C no longer functional)\u003c\/li\u003e\n\u003cli\u003eUnderdrive design frees up horsepower noticeable throttle response improvement\u003c\/li\u003e\n\u003cli\u003eRecommended for track, autocross, or high-performance street builds not for daily A\/C use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eEstimated time: 1-2 hours, moderate difficulty, basic hand tools required\u003c\/li\u003e\n\u003cli\u003eRemove stock pulley, install Kartboy pulley with factory bolt, torque to spec, reroute alternator belt\u003c\/li\u003e\n\u003cli\u003eProfessional installation recommended check timing marks and belt tension\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"8\" 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\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1992-2021\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza WRX \/ WRX STI\u003c\/td\u003e\n\u003ctd\u003eEJ20 \/ EJ25 Engines (A\/C Delete Setup)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2009\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eLegacy GT \/ Outback XT\u003c\/td\u003e\n\u003ctd\u003eEJ255 \/ EJ257 Engines (A\/C Delete)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2003-2014\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eForester XT\u003c\/td\u003e\n\u003ctd\u003eEJ25 Turbo Engines (A\/C Delete)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eEJ Series Swaps\u003c\/td\u003e\n\u003ctd\u003eCustom Turbo \u0026amp; Performance Builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhy Choose Kartboy Aluminum Crank Pulley?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight billet design reduces rotational mass quicker revs and throttle response\u003c\/li\u003e\n\u003cli\u003eA\/C delete frees up horsepower ideal for track or performance EJ builds\u003c\/li\u003e\n\u003cli\u003eLimited warranty trusted Subaru-specific upgrade from Kartboy\u003c\/li\u003e\n\u003c\/ul\u003e\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 Will this pulley fit my 2015 Subaru WRX STI EJ257? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, Kartboy KB-050-EJ-S fits all Subaru EJ20\/EJ25 engines with alternator belt and A\/C delete setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Does it eliminate A\/C completely? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, designed for A\/C pump delete; air conditioning will no longer function.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e How much power gain? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Small gains (5-10 whp typical) from reduced parasitic drag most noticeable in throttle response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What is the warranty? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Covered by Kartboy limited warranty built for performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS\/FedEx Ground\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 Secure protective packaging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approx. 2-3 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kartboy","offers":[{"title":"Default Title","offer_id":44488183480399,"sku":"KBYKB-050-EJ-S","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/kartboy-kb-050-ej-s-pulley.jpg?v=1771344919","url":"https:\/\/www.blackopsautoworks.com\/products\/kartboy-aluminum-crank-pulley-ej-for-alternator-belt-w-ac-pump-delete","provider":"Black Ops Auto Works","version":"1.0","type":"link"}