{"title":"PULLEYS \u0026 BELTS","description":"\u003cstyle\u003e\na {\n    text-decoration: none;\n    color: #464feb;\n}\ntr th, tr td {\n    border: 1px solid #e6e6e6;\n}\ntr th {\n    background-color: #f5f5f5;\n}\n\u003c\/style\u003e\n\u003cdiv\u003e\n\u003ch3\u003e\u003cstrong\u003eUnderdrive \u0026amp; Lightweight Crank Pulleys: Reduce Rotational Mass, Gain Real Performance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eUnderdrive and lightweight crank pulleys are precision-engineered upgrades designed to improve engine efficiency by reducing \u003cstrong\u003erotational mass\u003c\/strong\u003e and \u003cstrong\u003eparasitic drag\u003c\/strong\u003e. The factory crank pulley is often heavy and oversized, which means your engine spends extra energy spinning accessories like the alternator, power steering pump, and water pump. By replacing it with a \u003cstrong\u003elightweight aluminum pulley\u003c\/strong\u003e and slightly underdriving accessory speeds, you free up horsepower that would otherwise be lost to accessory load. This results in \u003cstrong\u003ebetter throttle response\u003c\/strong\u003e, quicker revs, and measurable \u003cstrong\u003ehorsepower gains\u003c\/strong\u003e without internal engine modifications.\u003c\/p\u003e\n\u003cp\u003eThe science behind the upgrade is simple: reducing the diameter and weight of the crank pulley lowers the \u003cstrong\u003einertia\u003c\/strong\u003e of the rotating assembly. Less inertia means the engine can accelerate faster, improving \u003cstrong\u003eRPM responsiveness\u003c\/strong\u003e and overall performance. Underdrive pulleys typically slow accessory drive speeds by 10–20%, which reduces strain on components while maintaining safe operating ranges. Combined with a high-quality \u003cstrong\u003eserpentine belt\u003c\/strong\u003e, this upgrade enhances reliability and efficiency for both street and track applications.\u003c\/p\u003e\n\u003cp\u003eBenefits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced rotational mass\u003c\/strong\u003e for faster engine acceleration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower accessory drag\u003c\/strong\u003e for improved horsepower and torque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced fuel efficiency\u003c\/strong\u003e under normal driving conditions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable construction\u003c\/strong\u003e for long-term reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhether you’re looking for a \u003cstrong\u003eperformance pulley kit\u003c\/strong\u003e, \u003cstrong\u003eunderdrive crank pulley\u003c\/strong\u003e, or \u003cstrong\u003elightweight accessory pulleys\u003c\/strong\u003e, STILLEN offers premium solutions engineered for perfect fitment and maximum gains. Upgrade today and experience the difference in power delivery and engine response.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"nissan-frontier-pathfinder-xterra-suzuki-equator-underdrive-pulley-belt-set-sku-400385b","title":"Nissan Frontier, Pathfinder, Xterra \/ Suzuki Equator - STILLEN Underdrive Pulley Belt Set - 400385B","description":"\u003ch2 class=\"oaimY _1ntuX\" style=\"text-align: center;\"\u003eNissan Frontier, Pathfinder, Xterra \/ Suzuki Equator Underdrive Pulley Belt Set - 400385B\u003c\/h2\u003e\r\u003cul\u003e\r\u003cli\u003eGates Belt Set for STILLEN Pulleys\u003c\/li\u003e\r\u003cli\u003eFor Use With Part #400385\u003c\/li\u003e\r\u003cli\u003eEngine Pulleys\u003c\/li\u003e\r\u003c\/ul\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073874223190,"sku":"400385b","price":49.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/Pulley_Belt_Set_IMG_02_4ec451ad-f52e-44f3-bfcd-211e5816d87b.jpg?v=1751490717"},{"product_id":"nissan-frontier-pathfinder-xterra-suzuki-equator-underdrive-performance-lightweight-crank-pulley-sku-400385","title":"Nissan Frontier, Pathfinder, Xterra \/ Suzuki Equator - STILLEN Underdrive Performance Lightweight Crank Pulley - 400385","description":"\u003ch3\u003e\u003cstrong\u003eFeatures \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight aerospace aluminum construction\u003c\/li\u003e\n\u003cli\u003eUnderdriven design transfers more power to the wheels\u003c\/li\u003e\n\u003cli\u003eImprovement in horsepower and torque\u003c\/li\u003e\n\u003cli\u003eImproved acceleration\u003c\/li\u003e\n\u003cli\u003eImproved fuel economy possible\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #FF0000;\"\u003e\u003cstrong\u003eNot for sale in California\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eNissan Frontier, Pathfinder, Xterra \/ Suzuki Equator STILLEN Underdrive Performance Lightweight Crank Pulley [400385] Description:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eUnderdrive pullies for the Nissan Frontier, Pathfinder, Xterra and Suzuki Equator are a great way to increase the horsepower and performance of your 4.0 V6 engine.  An underdrive crank pulley adds a number of different benefits with the end result being a significant gain in horsepower and torque.\u003c\/p\u003e\n\u003cp\u003eFor starter's, an underdrive crank pulley works by underdriving some of your accessories by only 10%.  These accessories require horsepower and torque to get them spinning.  By underdriving them a little bit we can free up some of that horsepower while not making a significant impact on their performance.  This reduction in parasitic drag allows the engine to transfer that recovered power to the wheels of your truck!\u003c\/p\u003e\n\u003cp\u003eAdditionally, the light weight aluminum construction further aids in reducing the power required to spin the heavy OEM crank pulley.  By reducing this weight it allows the engine to spin the crank pulley much more easily thus allowing for that recovered horsepower to be transferred to the wheels.  \u003c\/p\u003e\n\u003cp\u003eOverall, the combination of a lightweight, underdriven crank pulley leaves a result of a recovery of horsepower to the wheels that offers a noticeable improvement in horsepower, engine acceleration and fuel economy.\u003c\/p\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073874288726,"sku":"400385","price":195.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/performance-light-crank-pulley-img001_3_4025b19a-62e7-4f65-a8dd-43d7f642c119.jpg?v=1751490716"},{"product_id":"nissan-370z-z34-infiniti-fx35-g35-g37-q40-q50-q60-underdrive-performance-lightweight-crank-pulley","title":"Nissan 370Z [Z34] \/ Infiniti FX35, G35, G37, Q40, Q50, Q60 - STILLEN Underdrive Performance Lightweight Crank Pulley - 400370","description":"\u003ch3\u003e\u003cstrong\u003eFeatures \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUnderdrive Crank Pulley\u003c\/li\u003e\n\u003cli\u003eBillet Aluminum CNC Machined at STILLEN\u003c\/li\u003e\n\u003cli\u003eOEM Pulley Weight: 4.72 lbs.\u003c\/li\u003e\n\u003cli\u003eSTILLEN Pulley Weight: 0.99 lbs.\u003c\/li\u003e\n\u003cli\u003eApproximate Underdrive: 20%\u003c\/li\u003e\n\u003cli\u003eShorter Belt Required and Sold Separately (Replacement Belt #400370B)\u003c\/li\u003e\n\u003cli\u003e(Dual Throttle Body Engines)\u003c\/li\u003e\n\u003cli\u003eFits RWD \u0026amp; AWD Models\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #FF0000;\"\u003e\u003cstrong\u003eNot for sale in California\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eNissan 370Z [Z34] \/ Infiniti FX35, G35, G37, Q40, Q50, Q60 STILLEN Underdrive Performance Lightweight Crank Pulley [400370] Description:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eSTILLEN has long manufactured precision pulleys for our supercharger kits. We have used this expertise to produce a new line of high performance crank and accessory pulleys.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from 6061 aerospace grade billet aluminum with a bold new design to maximize performance, strength and minimum weight. 304 stainless steel sleeves are used for main seal contact points for durability. Stock timing marks are maintained and keyways are precision broached. All pulleys are CNC turned, milled and balanced based on computer generated designs.\u003c\/p\u003e\n\u003cp\u003eUp to 80% lighter weight than stock steel and up to 10% lighter than other aftermarket pulleys, we've seen power gains of up to 10+ HP at the wheels.\u003c\/p\u003e\n\u003cp\u003eBoth underdrive and stock diameter applications available for most popular Nissan \/ Infiniti vehicles.\u003c\/p\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073874321494,"sku":"400370","price":251.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/UD_Performance_light_crank_pulley_IMG_01.jpg?v=1751490715"},{"product_id":"2009-2015-nissan-maxima-2007-2012-altima-3-5-underdrive-performance-lightweight-crank-pulley-sku-400344","title":"2009-2015 Nissan Maxima \/ 2007-2012 Altima 3.5 - STILLEN Underdrive Performance Lightweight Crank Pulley - 400344","description":"\u003ch3\u003e\u003cstrong\u003eFeatures \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e6061 Aerospace Grade Billet Aluminum\u003c\/li\u003e\n\u003cli\u003eBold New Design Maximizing Performance, Strength and Minimum Weight\u003c\/li\u003e\n\u003cli\u003e304 Stainless Steel Sleeves for Main Seal Contact Points For Durability\u003c\/li\u003e\n\u003cli\u003eStock Timing Marks Maintained - Keyways are Precision Broached\u003c\/li\u003e\n\u003cli\u003eCNC Turned, Milled and Balanced from CAD Designs\u003c\/li\u003e\n\u003cli\u003eUnderdrive Applications - 20% Approximate Underdrive\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff2a00;\"\u003eNot for sale in California\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThis pulley requires the use of part number 400344B which is the correct length serepentine belt.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e2009-2015 Nissan Maxima \/ 2007-2012 Altima 3.5 Underdrive Performance Lightweight Crank Pulley [400344] Description:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eSTILLEN is proud to release our line of high performance STILLEN Lightweight Standard \/ Underdrive Pulleys for popular Nissan\/Infiniti applications.  OEM steel pulleys, especially crank pulleys, can be quite heavy, robbing horsepower.\u003c\/p\u003e\n\u003cp\u003eUpgrading these pulleys to a STILLEN 6061 Aluminum set reduces rotating mass, allowing for easier and quicker revving of the engine, resulting in increased performance.\u003c\/p\u003e\n\u003cp\u003eIn the case of underdrive applications, the reduced outside diameter of the pulley allows for the accessories to run slower, freeing up additional horsepower from the drivetrain, and putting that recovered power to the wheels.\u003c\/p\u003e\n\u003cp\u003eSTILLEN has a long heritage of machining precision pulleys for our supercharger kits, and used that expertise to create pulleys with a bold new design.  Weight savings is dramatic, up to \u003cstrong\u003e80% lighter than stock\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand up to \u003cstrong\u003e10% lighter than other aftermarket pulleys\u003c\/strong\u003e. We have seen power gains of up to \u003cstrong\u003e10+ HP at the wheels\u003c\/strong\u003e.\u003c\/p\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073874419798,"sku":"400344","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/400344_UD_Performance_light_crank_pulley_IMG_01.jpg?v=1751490714"},{"product_id":"nissan-frontier-pathfinder-xterra-suzuki-equator-standard-performance-lightweight-crank-pulley-belt-set-sku-400380b","title":"Nissan Frontier, Pathfinder, Xterra \/ Suzuki Equator - STILLEN Standard Performance Lightweight Crank Pulley Belt Set - 400380B","description":"\u003ch2 class=\"oaimY _1ntuX\" style=\"text-align: center;\"\u003eNissan Frontier, Pathfinder, Xterra \/ Suzuki Equator Standard Performance Lightweight Crank Pulley Belt Set - 400380B\u003c\/h2\u003e\r\u003cul\u003e\r\u003cli\u003eGates Belt Set for STILLEN Pulleys\u003c\/li\u003e\r\u003cli\u003eFor Use With Part #400380; (Without Supercharger - Call For S\/C Belt); Gates Belt for 400380 (w\/out SC) or OEM Pulley (w\/out SC)\u003cbr\u003e\r\u003c\/li\u003e\r\u003cli\u003eEngine Pulleys\u003c\/li\u003e\r\u003c\/ul\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073875501142,"sku":"400380b","price":39.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/Pulley_Belt_Set_IMG_02_a2339554-4c80-48c4-91f1-ef0f24d95a8e.jpg?v=1751490711"},{"product_id":"nissan-frontier-pathfinder-xterra-suzuki-equator-standard-performance-lightweight-crank-pulley-sku-400380","title":"Nissan Frontier, Pathfinder, Xterra \/ Suzuki Equator - STILLEN Standard Performance Lightweight Crank Pulley - 400380","description":"\u003ch3\u003e\u003cstrong\u003eFeatures \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAircraft quality aluminum construction\u003c\/li\u003e\n\u003cli\u003eIncreases horsepower and torque\u003c\/li\u003e\n\u003cli\u003eIncreases engines ability to accelerate (rev) freely\u003c\/li\u003e\n\u003cli\u003eMade to the highest industry standards\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #FF0000;\"\u003e\u003cstrong\u003eNot for sale in California\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eNissan Frontier, Pathfinder, Xterra \/ Suzuki Equator STILLEN Standard Performance Lightweight Crank Pulley [400380] Description:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA lightweight crank pulley is a great way to release some extra horsepower from your vehicle!  Factory cast iron crank pullies are inefficient and take horsepower from the engine in order to get them spinning.  The additional mass on the crank shaft slows down engine RPM and robs horsepower.  By replacing the crank pulley with a lightweight aluminum pulley you are allowing the engine to accelerate easily and free up some horsepower!\u003c\/p\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073875533910,"sku":"400380","price":218.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/performance-light-crank-pulley-img001_2_b81a4ea0-0b65-4c8f-82c5-bdbde4db4d9a.jpg?v=1751490710"},{"product_id":"nissan-350z-z33-infiniti-fx35-g35-g37-q40-q50-q60-standard-performance-lightweight-crank-pulley-sku-400338","title":"Nissan 370Z\/350Z  \/ Infiniti FX35, G35, G37, Q40, Q50, Q60 - STILLEN Standard Performance Lightweight Crank Pulley - 400338","description":"\u003ch3\u003e\u003cstrong\u003eFeatures \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStandard Sized Lightweight Crank Pulley\u003c\/li\u003e\n\u003cli\u003eBillet Aluminum CNC Machined at STILLEN\u003c\/li\u003e\n\u003cli\u003eOEM Pulley Weight: 4.72 lbs.\u003c\/li\u003e\n\u003cli\u003eSTILLEN Pulley Weight: 1.32 lbs.\u003c\/li\u003e\n\u003cli\u003eReplacement Belt #40338B\u003c\/li\u003e\n\u003cli\u003eSuitable For Use with STILLEN Supercharger\u003c\/li\u003e\n\u003cli\u003e(Dual Throttle Body Engines)\u003c\/li\u003e\n\u003cli\u003eFits RWD \u0026amp; AWD Models\u003c\/li\u003e\n\u003cli style=\"font-weight: bold; color: rgb(255, 42, 0);\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eNOT FOR SALE OR USE IN CALIFORNIA\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eNissan 370Z, 350Z \/ Infiniti FX35, G35, G37, Q40, Q50, Q60 Standard Performance Lightweight Crank Pulley [400338] Description:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eSTILLEN has long manufactured precision pulleys for our supercharger kits. We have used this expertise to produce a new line of high performance crank and accessory pulleys.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from 6061 aerospace grade billet aluminum with a bold new design to maximize performance, strength and minimum weight. 304 stainless steel sleeves are used for main seal contact points for durability. Stock timing marks are maintained and keyways are precision broached. All pulleys are CNC turned, milled and balanced based on computer generated designs.\u003c\/p\u003e\n\u003cp\u003eUp to 80% lighter weight than stock steel and up to 10% lighter than other aftermarket pulleys, we've seen power gains of up to 10+ HP at the wheels.\u003c\/p\u003e\n\u003cp\u003eBoth underdrive and stock diameter applications available for most popular Nissan \/ Infiniti vehicles.\u003c\/p\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073875632214,"sku":"400338","price":251.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/SD_Performance_light_crank_pulley_IMG_02.jpg?v=1751490709"},{"product_id":"nissan-370z-infiniti-g37-q40-q50-q60-gates-underdrive-pulley-belt-set-sku-400370b","title":"Nissan 370Z \/ Infiniti G37, Q40, Q50, Q60 - STILLEN Gates Underdrive Pulley Belt Set - 400370B","description":"\u003ch2 style=\"text-align: center;\"\u003eNissan 370Z \/ Infiniti G37, Q40, Q50, Q60 Gates Underdrive Pulley Belt Set - 400370B\u003c\/h2\u003e\r\u003cul\u003e\r\u003cli\u003eGates Belt Set for STILLEN Pulleys\u003c\/li\u003e\r\u003cli\u003eFor Use With Part #400370\u003c\/li\u003e\r\u003cli\u003eFits RWD \u0026amp; AWD Models\u003c\/li\u003e\r\u003cli\u003eEngine Pulleys\u003c\/li\u003e\r\u003c\/ul\u003e","brand":"STILLEN","offers":[{"title":"Default Title","offer_id":29073876582486,"sku":"400370B","price":69.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/4275\/8230\/products\/Pulley_Belt_Set_IMG_02.jpg?v=1751490703"},{"product_id":"2007-2009-nissan-350z-2007-2009-infiniti-fx35-2007-2008-g35-gates-underdrive-pulley-belt-set-sku-400370bz","title":"2007-2009 Nissan 350Z \/ 2007-2009 Infiniti FX35, 2007-2008 G35 - STILLEN Underdrive Pulley Belt Set - 400370bz","description":"\u003ch2 style=\"text-align: center;\"\u003e2007-2009 Nissan 350Z \/ 2007-2009 Infiniti FX35, 2007-2008 G35 Underdrive Pulley Belt Set - 400370bz\u003c\/h2\u003e\r\u003cul\u003e\r\u003cli\u003eGates Belt Set for STILLEN Pulleys\u003c\/li\u003e\r\u003cli\u003eFor Use With Part #400370\u003c\/li\u003e\r\u003cli\u003eDual Throttle Body Engines Only\u003c\/li\u003e\r\u003cli\u003eFits 2007-2009 Nissan 350Z [Z33]¦\u003c\/li\u003e\r\u003cli\u003eFits 2007-2009 Infiniti FX35\u003c\/li\u003e\r\u003cli\u003eFits 2007-2008 G35\u003c\/li\u003e\r\u003cli\u003eRepresentative Image Only - 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