{"product_id":"bmw-b58-gen2-auxiliary-split-fuel-system","title":"Spool Performance  Auxiliary Split Fuel System BMW B58 Gen2","description":"\u003ch2 data-end=\"282\" data-start=\"230\"\u003eSpool Performance B58 Gen 2 Auxiliary Fuel System\u003c\/h2\u003e\n\u003cp data-end=\"529\" data-start=\"284\"\u003eThe \u003cstrong data-end=\"341\" data-start=\"288\"\u003eSpool Performance B58 Gen 2 Auxiliary Fuel System\u003c\/strong\u003e is designed for B58 Gen 2 owners pushing beyond the limits of the factory fuel system who want a solution that’s properly engineered, easy to install, and built for long-term reliability.\u003c\/p\u003e\n\u003cp data-end=\"771\" data-start=\"531\"\u003eFrom the start, our focus was on correct fuel architecture and real-world usability. Every component and layout choice was made to deliver stable, predictable fueling at higher power levels while keeping installation clean and OEM-friendly.\u003c\/p\u003e\n\u003ch3 data-end=\"828\" data-start=\"773\"\u003eWhy a Properly Designed DI + PI Fuel System Matters\u003c\/h3\u003e\n\u003cp data-end=\"1009\" data-start=\"830\"\u003eAs power levels increase on the B58 Gen 2 platform, fueling challenges typically arise when \u003cstrong data-end=\"1008\" data-start=\"922\"\u003edirect injection (DI) and port injection (PI) are supplied from the same fuel feed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-end=\"1039\" data-start=\"1011\"\u003eWhen DI and PI share a feed:\u003c\/p\u003e\n\u003cul data-end=\"1361\" data-start=\"1041\"\u003e\n\u003cli data-end=\"1147\" data-start=\"1041\"\u003e\n\u003cp data-end=\"1147\" data-start=\"1043\"\u003eThe pulsed nature of DI can introduce pressure fluctuations that disrupt fuel flow to the PI injectors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1262\" data-start=\"1148\"\u003e\n\u003cp data-end=\"1262\" data-start=\"1150\"\u003ePort injection requires boost-referenced fuel pressure to maintain consistent injector differential under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1361\" data-start=\"1263\"\u003e\n\u003cp data-end=\"1361\" data-start=\"1265\"\u003eAt higher boost and airflow, maintaining precise and repeatable fueling becomes more difficult\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1575\" data-start=\"1363\"\u003eBy separating the DI and PI supply, each system is able to operate independently and exactly as intended. The result is \u003cstrong data-end=\"1574\" data-start=\"1483\"\u003esmoother fuel delivery, improved consistency, and greater confidence as power increases\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-end=\"1608\" data-start=\"1577\"\u003eDesigned to Install Cleanly\u003c\/h3\u003e\n\u003cp data-end=\"1741\" data-start=\"1610\"\u003eA significant amount of development time went into making this system straightforward to install without unnecessary modifications.\u003c\/p\u003e\n\u003cul data-end=\"2185\" data-start=\"1743\"\u003e\n\u003cli data-end=\"1960\" data-start=\"1743\"\u003e\n\u003cp data-end=\"1960\" data-start=\"1745\"\u003e\u003cstrong data-end=\"1894\" data-start=\"1745\"\u003eThe OEM fuel pump top hat is retained using additional precision-machined aluminum fuel fittings that integrate directly into the factory top hat\u003c\/strong\u003e, eliminating the need for repinning or modifying factory wiring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2044\" data-start=\"1961\"\u003e\n\u003cp data-end=\"2044\" data-start=\"1963\"\u003e\u003cstrong data-end=\"2016\" data-start=\"1963\"\u003eOptional billet top hats are available separately\u003c\/strong\u003e for those who prefer them\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2185\" data-start=\"2045\"\u003e\n\u003cp data-end=\"2185\" data-start=\"2047\"\u003e\u003cstrong data-end=\"2145\" data-start=\"2047\"\u003eA plug-and-play wiring harness is supplied for direct compatibility with the Reflex controller\u003c\/strong\u003e, simplifying installation and control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2294\" data-start=\"2187\"\u003eThese design choices keep the install clean, reduce complexity, and maintain a factory-like fit and finish.\u003c\/p\u003e\n\u003ch3 data-end=\"2333\" data-start=\"2296\"\u003eScalable Pump and Control Options\u003c\/h3\u003e\n\u003cp data-end=\"2379\" data-start=\"2335\"\u003eThe system is built to grow with your setup:\u003c\/p\u003e\n\u003cul data-end=\"2613\" data-start=\"2381\"\u003e\n\u003cli data-end=\"2431\" data-start=\"2381\"\u003e\n\u003cp data-end=\"2431\" data-start=\"2383\"\u003e\u003cstrong data-end=\"2431\" data-start=\"2383\"\u003eDual Walbro 450 fuel pumps included standard\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2504\" data-start=\"2432\"\u003e\n\u003cp data-end=\"2504\" data-start=\"2434\"\u003e\u003cstrong data-end=\"2466\" data-start=\"2434\"\u003eOptional Walbro 525 upgrades\u003c\/strong\u003e available for higher horsepower goals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2613\" data-start=\"2505\"\u003e\n\u003cp data-end=\"2517\" data-start=\"2507\"\u003eChoice of:\u003c\/p\u003e\n\u003cul data-end=\"2613\" data-start=\"2520\"\u003e\n\u003cli data-end=\"2552\" data-start=\"2520\"\u003e\n\u003cp data-end=\"2552\" data-start=\"2522\"\u003eStandard relay configuration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2613\" data-start=\"2555\"\u003e\n\u003cp data-end=\"2613\" data-start=\"2557\"\u003e\u003cstrong data-end=\"2585\" data-start=\"2557\"\u003eSolid-state relay option\u003c\/strong\u003e for full PWM pump control available for purchase separately. NOTE: 2 harnesses required per AFS Kit - Link to Harness: https:\/\/spoolperformance.com\/products\/untitled-may18_19-53-33?_pos=1\u0026amp;_sid=2a7c2a7b8\u0026amp;_ss=r\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2719\" data-start=\"2615\"\u003eThis flexibility allows you to match the fuel system to your current build while leaving room to expand.\u003c\/p\u003e\n\u003ch3 data-end=\"2751\" data-start=\"2721\"\u003eHigh-Quality Fuel Plumbing\u003c\/h3\u003e\n\u003cp data-end=\"2831\" data-start=\"2753\"\u003eAll fuel lines included in the kit feature \u003cstrong data-end=\"2830\" data-start=\"2796\"\u003etriple-layer PTFE construction\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul data-end=\"3039\" data-start=\"2833\"\u003e\n\u003cli data-end=\"2896\" data-start=\"2833\"\u003e\n\u003cp data-end=\"2896\" data-start=\"2835\"\u003eInner \u003cstrong data-end=\"2854\" data-start=\"2841\"\u003ePTFE core\u003c\/strong\u003e for full fuel and ethanol compatibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2963\" data-start=\"2897\"\u003e\n\u003cp data-end=\"2963\" data-start=\"2899\"\u003eMiddle \u003cstrong data-end=\"2939\" data-start=\"2906\"\u003estainless steel reinforcement\u003c\/strong\u003e for pressure strength\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3039\" data-start=\"2964\"\u003e\n\u003cp data-end=\"3039\" data-start=\"2966\"\u003eOuter \u003cstrong data-end=\"2998\" data-start=\"2972\"\u003enylon protective layer\u003c\/strong\u003e for abrasion resistance and durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3118\" data-start=\"3041\"\u003eThis ensures long-term reliability in high-heat, high-vibration environments.\u003c\/p\u003e\n\u003ch3 data-end=\"3171\" data-start=\"3120\"\u003eCompact, Purpose-Built Fuel Pressure Regulation\u003c\/h3\u003e\n\u003cp data-end=\"3323\" data-start=\"3173\"\u003eThe system includes Spool Performance’s \u003cstrong data-end=\"3266\" data-start=\"3213\"\u003ein-house designed compact fuel pressure regulator\u003c\/strong\u003e, developed specifically for auxiliary fuel applications:\u003c\/p\u003e\n\u003cul data-end=\"3521\" data-start=\"3325\"\u003e\n\u003cli data-end=\"3386\" data-start=\"3325\"\u003e\n\u003cp data-end=\"3386\" data-start=\"3327\"\u003eBoost-referenced for accurate pressure control under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3427\" data-start=\"3387\"\u003e\n\u003cp data-end=\"3427\" data-start=\"3389\"\u003eStable regulation at high flow rates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3477\" data-start=\"3428\"\u003e\n\u003cp data-end=\"3477\" data-start=\"3430\"\u003eCompact design for clean engine bay packaging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3521\" data-start=\"3478\"\u003e\n\u003cp data-end=\"3521\" data-start=\"3480\"\u003eBuilt to withstand demanding conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"3568\" data-start=\"3523\"\u003eBuilt to Support Serious B58 Gen 2 Builds\u003c\/h3\u003e\n\u003cp data-end=\"3788\" data-start=\"3570\"\u003eWhether you’re building a strong street car or planning a higher-power setup, the Spool Performance B58 Gen 2 Auxiliary Fuel System delivers the fueling control and capacity needed to push the platform with confidence.\u003c\/p\u003e\n\u003cp data-end=\"4030\" data-start=\"3790\"\u003eWith properly separated DI and PI supply, OEM-friendly integration using precision aluminum fittings, Reflex compatibility, high-quality plumbing, and scalable pump options, this system is designed to perform reliably as your build evolves.\u003c\/p\u003e\n\u003cp data-end=\"4208\" data-start=\"4032\"\u003e\u003cstrong data-end=\"4208\" data-start=\"4032\"\u003eIf you’re ready to upgrade your B58 Gen 2 fueling with a system that’s thoughtfully engineered and genuinely easy to live with, this is the solution built to get you there.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-end=\"4213\" data-start=\"4210\"\u003e\n\u003ch3 data-end=\"4230\" data-start=\"4215\"\u003e\u003cstrong data-end=\"4230\" data-start=\"4219\"\u003eFitment\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"4338\" data-start=\"4232\"\u003eThis auxiliary fuel system is designed for BMW vehicles equipped with the \u003cstrong data-end=\"4326\" data-start=\"4306\"\u003eB58 Gen 2 engine\u003c\/strong\u003e, including:\u003c\/p\u003e\n\u003cul data-end=\"4743\" data-start=\"4340\"\u003e\n\u003cli data-end=\"4433\" data-start=\"4340\"\u003e\n\u003cp data-end=\"4433\" data-start=\"4342\"\u003e\u003cstrong data-end=\"4423\" data-start=\"4342\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBMW M340i\u003c\/span\u003e\u003c\/span\u003e \/ \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBMW M340i xDrive\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e – 2020+\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4527\" data-start=\"4434\"\u003e\n\u003cp data-end=\"4527\" data-start=\"4436\"\u003e\u003cstrong data-end=\"4517\" data-start=\"4436\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBMW M440i\u003c\/span\u003e\u003c\/span\u003e \/ \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBMW M440i xDrive\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e – 2021+\u003cstrong data-end=\"4571\" data-start=\"4530\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4689\" data-start=\"4636\"\u003e\n\u003cp data-end=\"4689\" data-start=\"4638\"\u003e\u003cstrong data-end=\"4679\" data-start=\"4638\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBMW X3 M40i\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e – 2020+\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4743\" data-start=\"4690\"\u003e\n\u003cp data-end=\"4743\" data-start=\"4692\"\u003e\u003cstrong data-end=\"4733\" data-start=\"4692\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBMW X4 M40i\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e – 2020+\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Spool Performance","offers":[{"title":"Walbro 450 with check valves","offer_id":53519895363900,"sku":"SP-B58G2AUXF450","price":1869.0,"currency_code":"CAD","in_stock":true},{"title":"Walbro 525 with check valves","offer_id":53519895396668,"sku":"SP-B58G2AUXF525","price":2301.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0714\/3070\/1372\/files\/1_e38a945a-693e-46c8-bb51-98c91f42313e.png?v=1784239611","url":"https:\/\/trucranemotorsports.com\/en-ca\/products\/bmw-b58-gen2-auxiliary-split-fuel-system","provider":"TruCrane Motorsports","version":"1.0","type":"link"}