{"product_id":"sp-b58g2auxf450","title":"BMW B58 GEN2 AUXILIARY SPLIT FUEL SYSTEM","description":"\u003ch2 data-start=\"230\" data-end=\"282\"\u003eSpool Performance B58 Gen 2 Auxiliary Fuel System\u003c\/h2\u003e\n\u003cp data-start=\"284\" data-end=\"529\"\u003eThe \u003cstrong data-start=\"288\" data-end=\"341\"\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-start=\"531\" data-end=\"771\"\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-start=\"773\" data-end=\"828\"\u003eWhy a Properly Designed DI + PI Fuel System Matters\u003c\/h3\u003e\n\u003cp data-start=\"830\" data-end=\"1009\"\u003eAs power levels increase on the B58 Gen 2 platform, fueling challenges typically arise when \u003cstrong data-start=\"922\" data-end=\"1008\"\u003edirect injection (DI) and port injection (PI) are supplied from the same fuel feed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"1011\" data-end=\"1039\"\u003eWhen DI and PI share a feed:\u003c\/p\u003e\n\u003cul data-start=\"1041\" data-end=\"1361\"\u003e\n\u003cli data-start=\"1041\" data-end=\"1147\"\u003e\n\u003cp data-start=\"1043\" data-end=\"1147\"\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-start=\"1148\" data-end=\"1262\"\u003e\n\u003cp data-start=\"1150\" data-end=\"1262\"\u003ePort injection requires boost-referenced fuel pressure to maintain consistent injector differential under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1263\" data-end=\"1361\"\u003e\n\u003cp data-start=\"1265\" data-end=\"1361\"\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-start=\"1363\" data-end=\"1575\"\u003eBy separating the DI and PI supply, each system is able to operate independently and exactly as intended. The result is \u003cstrong data-start=\"1483\" data-end=\"1574\"\u003esmoother fuel delivery, improved consistency, and greater confidence as power increases\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-start=\"1577\" data-end=\"1608\"\u003eDesigned to Install Cleanly\u003c\/h3\u003e\n\u003cp data-start=\"1610\" data-end=\"1741\"\u003eA significant amount of development time went into making this system straightforward to install without unnecessary modifications.\u003c\/p\u003e\n\u003cul data-start=\"1743\" data-end=\"2185\"\u003e\n\u003cli data-start=\"1743\" data-end=\"1960\"\u003e\n\u003cp data-start=\"1745\" data-end=\"1960\"\u003e\u003cstrong data-start=\"1745\" data-end=\"1894\"\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-start=\"1961\" data-end=\"2044\"\u003e\n\u003cp data-start=\"1963\" data-end=\"2044\"\u003e\u003cstrong data-start=\"1963\" data-end=\"2016\"\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-start=\"2045\" data-end=\"2185\"\u003e\n\u003cp data-start=\"2047\" data-end=\"2185\"\u003e\u003cstrong data-start=\"2047\" data-end=\"2145\"\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-start=\"2187\" data-end=\"2294\"\u003eThese design choices keep the install clean, reduce complexity, and maintain a factory-like fit and finish.\u003c\/p\u003e\n\u003ch3 data-start=\"2296\" data-end=\"2333\"\u003eScalable Pump and Control Options\u003c\/h3\u003e\n\u003cp data-start=\"2335\" data-end=\"2379\"\u003eThe system is built to grow with your setup:\u003c\/p\u003e\n\u003cul data-start=\"2381\" data-end=\"2613\"\u003e\n\u003cli data-start=\"2381\" data-end=\"2431\"\u003e\n\u003cp data-start=\"2383\" data-end=\"2431\"\u003e\u003cstrong data-start=\"2383\" data-end=\"2431\"\u003eDual Walbro 450 fuel pumps included standard\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2432\" data-end=\"2504\"\u003e\n\u003cp data-start=\"2434\" data-end=\"2504\"\u003e\u003cstrong data-start=\"2434\" data-end=\"2466\"\u003eOptional Walbro 525 upgrades\u003c\/strong\u003e available for higher horsepower goals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2505\" data-end=\"2613\"\u003e\n\u003cp data-start=\"2507\" data-end=\"2517\"\u003eChoice of:\u003c\/p\u003e\n\u003cul data-start=\"2520\" data-end=\"2613\"\u003e\n\u003cli data-start=\"2520\" data-end=\"2552\"\u003e\n\u003cp data-start=\"2522\" data-end=\"2552\"\u003eStandard relay configuration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2555\" data-end=\"2613\"\u003e\n\u003cp data-start=\"2557\" data-end=\"2613\"\u003e\u003cstrong data-start=\"2557\" data-end=\"2585\"\u003eSolid-state relay option\u003c\/strong\u003e for full PWM pump control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2615\" data-end=\"2719\"\u003eThis flexibility allows you to match the fuel system to your current build while leaving room to expand.\u003c\/p\u003e\n\u003ch3 data-start=\"2721\" data-end=\"2751\"\u003eHigh-Quality Fuel Plumbing\u003c\/h3\u003e\n\u003cp data-start=\"2753\" data-end=\"2831\"\u003eAll fuel lines included in the kit feature \u003cstrong data-start=\"2796\" data-end=\"2830\"\u003etriple-layer PTFE construction\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul data-start=\"2833\" data-end=\"3039\"\u003e\n\u003cli data-start=\"2833\" data-end=\"2896\"\u003e\n\u003cp data-start=\"2835\" data-end=\"2896\"\u003eInner \u003cstrong data-start=\"2841\" data-end=\"2854\"\u003ePTFE core\u003c\/strong\u003e for full fuel and ethanol compatibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2897\" data-end=\"2963\"\u003e\n\u003cp data-start=\"2899\" data-end=\"2963\"\u003eMiddle \u003cstrong data-start=\"2906\" data-end=\"2939\"\u003estainless steel reinforcement\u003c\/strong\u003e for pressure strength\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2964\" data-end=\"3039\"\u003e\n\u003cp data-start=\"2966\" data-end=\"3039\"\u003eOuter \u003cstrong data-start=\"2972\" data-end=\"2998\"\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-start=\"3041\" data-end=\"3118\"\u003eThis ensures long-term reliability in high-heat, high-vibration environments.\u003c\/p\u003e\n\u003ch3 data-start=\"3120\" data-end=\"3171\"\u003eCompact, Purpose-Built Fuel Pressure Regulation\u003c\/h3\u003e\n\u003cp data-start=\"3173\" data-end=\"3323\"\u003eThe system includes Spool Performance’s \u003cstrong data-start=\"3213\" data-end=\"3266\"\u003ein-house designed compact fuel pressure regulator\u003c\/strong\u003e, developed specifically for auxiliary fuel applications:\u003c\/p\u003e\n\u003cul data-start=\"3325\" data-end=\"3521\"\u003e\n\u003cli data-start=\"3325\" data-end=\"3386\"\u003e\n\u003cp data-start=\"3327\" data-end=\"3386\"\u003eBoost-referenced for accurate pressure control under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3387\" data-end=\"3427\"\u003e\n\u003cp data-start=\"3389\" data-end=\"3427\"\u003eStable regulation at high flow rates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3428\" data-end=\"3477\"\u003e\n\u003cp data-start=\"3430\" data-end=\"3477\"\u003eCompact design for clean engine bay packaging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3478\" data-end=\"3521\"\u003e\n\u003cp data-start=\"3480\" data-end=\"3521\"\u003eBuilt to withstand demanding conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"3523\" data-end=\"3568\"\u003eBuilt to Support Serious B58 Gen 2 Builds\u003c\/h3\u003e\n\u003cp data-start=\"3570\" data-end=\"3788\"\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-start=\"3790\" data-end=\"4030\"\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-start=\"4032\" data-end=\"4208\"\u003e\u003cstrong data-start=\"4032\" data-end=\"4208\"\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-start=\"4210\" data-end=\"4213\"\u003e\n\u003ch3 data-start=\"4215\" data-end=\"4230\"\u003e\u003cstrong data-start=\"4219\" data-end=\"4230\"\u003eFitment\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4232\" data-end=\"4338\"\u003eThis auxiliary fuel system is designed for BMW vehicles equipped with the \u003cstrong data-start=\"4306\" data-end=\"4326\"\u003eB58 Gen 2 engine\u003c\/strong\u003e, including:\u003c\/p\u003e\n\u003cul data-start=\"4340\" data-end=\"4743\"\u003e\n\u003cli data-start=\"4340\" data-end=\"4433\"\u003e\n\u003cp data-start=\"4342\" data-end=\"4433\"\u003e\u003cstrong data-start=\"4342\" data-end=\"4423\"\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-start=\"4434\" data-end=\"4527\"\u003e\n\u003cp data-start=\"4436\" data-end=\"4527\"\u003e\u003cstrong data-start=\"4436\" data-end=\"4517\"\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-start=\"4530\" data-end=\"4571\"\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-start=\"4636\" data-end=\"4689\"\u003e\n\u003cp data-start=\"4638\" data-end=\"4689\"\u003e\u003cstrong data-start=\"4638\" data-end=\"4679\"\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-start=\"4690\" data-end=\"4743\"\u003e\n\u003cp data-start=\"4692\" data-end=\"4743\"\u003e\u003cstrong data-start=\"4692\" data-end=\"4733\"\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":"Default Title","offer_id":47533153419522,"sku":"SP-B58G2AUXF450","price":1799.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0266\/5450\/7191\/files\/12_png.avif?v=1774044116","url":"https:\/\/euroklasse.com\/products\/sp-b58g2auxf450","provider":"EuroKlasse INC","version":"1.0","type":"link"}