{"product_id":"bmw-b58-gen1-auxiliary-split-fuel-system","title":"BMW B58 Gen1 Auxiliary Split Fuel System","description":"\u003ch2 data-end=\"314\" data-start=\"258\"\u003eSpool Performance BMW B58 Gen 1 Auxiliary Fuel System\u003c\/h2\u003e\n\u003cp data-end=\"559\" data-start=\"316\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"377\" data-start=\"320\"\u003eSpool Performance BMW B58 Gen 1 Auxiliary Fuel System\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis designed for B58 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=\"808\" data-start=\"561\"\u003eFrom the beginning, our focus was on correct fuel architecture and real-world usability. Every component and layout choice was made to deliver stable, predictable fueling as power levels increase, while keeping installation clean and OEM-friendly.\u003c\/p\u003e\n\u003ch3 data-end=\"862\" data-start=\"810\"\u003eWhy a Properly Split DI + PI Fuel System Matters\u003c\/h3\u003e\n\u003cp data-end=\"1033\" data-start=\"864\"\u003eAs power levels rise on the B58 platform, fueling challenges most commonly come from\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"1032\" data-start=\"949\"\u003esupplying direct injection (DI) and port injection (PI) from the same fuel feed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-end=\"1063\" data-start=\"1035\"\u003eWhen DI and PI share a feed:\u003c\/p\u003e\n\u003cul data-end=\"1387\" data-start=\"1065\"\u003e\n\u003cli data-end=\"1171\" data-start=\"1065\"\u003e\n\u003cp data-end=\"1171\" data-start=\"1067\"\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=\"1288\" data-start=\"1172\"\u003e\n\u003cp data-end=\"1288\" data-start=\"1174\"\u003ePort injection requires boost-referenced fuel pressure to maintain a consistent injector differential under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1387\" data-start=\"1289\"\u003e\n\u003cp data-end=\"1387\" data-start=\"1291\"\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=\"1591\" data-start=\"1389\"\u003eBy separating the DI and PI supply, each system operates independently and exactly as intended. The result is\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"1590\" data-start=\"1499\"\u003esmoother fuel delivery, improved consistency, and greater confidence as power increases\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-end=\"1624\" data-start=\"1593\"\u003eDesigned to Install Cleanly\u003c\/h3\u003e\n\u003cp data-end=\"1757\" data-start=\"1626\"\u003eA significant amount of development time went into making this system straightforward to install without unnecessary modifications.\u003c\/p\u003e\n\u003cul data-end=\"2201\" data-start=\"1759\"\u003e\n\u003cli data-end=\"1976\" data-start=\"1759\"\u003e\n\u003cp data-end=\"1976\" data-start=\"1761\"\u003e\u003cstrong data-end=\"1910\" data-start=\"1761\"\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=\"2060\" data-start=\"1977\"\u003e\n\u003cp data-end=\"2060\" data-start=\"1979\"\u003e\u003cstrong data-end=\"2032\" data-start=\"1979\"\u003eOptional billet top hats are available separately\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor those who prefer them\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2201\" data-start=\"2061\"\u003e\n\u003cp data-end=\"2201\" data-start=\"2063\"\u003e\u003cstrong data-end=\"2161\" data-start=\"2063\"\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=\"2310\" data-start=\"2203\"\u003eThese design choices keep the install clean, reduce complexity, and maintain a factory-like fit and finish.\u003c\/p\u003e\n\u003ch3 data-end=\"2349\" data-start=\"2312\"\u003eScalable Pump and Control Options\u003c\/h3\u003e\n\u003cp data-end=\"2395\" data-start=\"2351\"\u003eThe system is built to grow with your setup:\u003c\/p\u003e\n\u003cul data-end=\"2629\" data-start=\"2397\"\u003e\n\u003cli data-end=\"2447\" data-start=\"2397\"\u003e\n\u003cp data-end=\"2447\" data-start=\"2399\"\u003e\u003cstrong data-end=\"2447\" data-start=\"2399\"\u003eDual Walbro 450 fuel pumps included standard\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2520\" data-start=\"2448\"\u003e\n\u003cp data-end=\"2520\" data-start=\"2450\"\u003e\u003cstrong data-end=\"2482\" data-start=\"2450\"\u003eOptional Walbro 525 upgrades\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eavailable for higher horsepower goals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2629\" data-start=\"2521\"\u003e\n\u003cp data-end=\"2533\" data-start=\"2523\"\u003eChoice of:\u003c\/p\u003e\n\u003cul data-end=\"2629\" data-start=\"2536\"\u003e\n\u003cli data-end=\"2568\" data-start=\"2536\"\u003e\n\u003cp data-end=\"2568\" data-start=\"2538\"\u003eStandard relay configuration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2629\" data-start=\"2571\"\u003e\n\u003cp data-end=\"2629\" data-start=\"2573\"\u003e\u003cstrong data-end=\"2601\" data-start=\"2573\"\u003eSolid-state relay option\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor 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-end=\"2735\" data-start=\"2631\"\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=\"2767\" data-start=\"2737\"\u003eHigh-Quality Fuel Plumbing\u003c\/h3\u003e\n\u003cp data-end=\"2847\" data-start=\"2769\"\u003eAll fuel lines included in the kit feature\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"2846\" data-start=\"2812\"\u003etriple-layer PTFE construction\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul data-end=\"3055\" data-start=\"2849\"\u003e\n\u003cli data-end=\"2912\" data-start=\"2849\"\u003e\n\u003cp data-end=\"2912\" data-start=\"2851\"\u003eInner\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"2870\" data-start=\"2857\"\u003ePTFE core\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor full fuel and ethanol compatibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2979\" data-start=\"2913\"\u003e\n\u003cp data-end=\"2979\" data-start=\"2915\"\u003eMiddle\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"2955\" data-start=\"2922\"\u003estainless steel reinforcement\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor pressure strength\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3055\" data-start=\"2980\"\u003e\n\u003cp data-end=\"3055\" data-start=\"2982\"\u003eOuter\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"3014\" data-start=\"2988\"\u003enylon protective layer\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor abrasion resistance and durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3166\" data-start=\"3057\"\u003eThis ensures long-term reliability in high-heat, high-vibration environments and with aggressive fuel blends.\u003c\/p\u003e\n\u003ch3 data-end=\"3219\" data-start=\"3168\"\u003eCompact, Purpose-Built Fuel Pressure Regulation\u003c\/h3\u003e\n\u003cp data-end=\"3371\" data-start=\"3221\"\u003eThe system includes Spool Performance’s\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"3314\" data-start=\"3261\"\u003ein-house designed compact fuel pressure regulator\u003c\/strong\u003e, developed specifically for auxiliary fuel applications:\u003c\/p\u003e\n\u003cul data-end=\"3569\" data-start=\"3373\"\u003e\n\u003cli data-end=\"3434\" data-start=\"3373\"\u003e\n\u003cp data-end=\"3434\" data-start=\"3375\"\u003eBoost-referenced for accurate pressure control under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3475\" data-start=\"3435\"\u003e\n\u003cp data-end=\"3475\" data-start=\"3437\"\u003eStable regulation at high flow rates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3525\" data-start=\"3476\"\u003e\n\u003cp data-end=\"3525\" data-start=\"3478\"\u003eCompact design for clean engine bay packaging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3569\" data-start=\"3526\"\u003e\n\u003cp data-end=\"3569\" data-start=\"3528\"\u003eBuilt to withstand demanding conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"3609\" data-start=\"3571\"\u003eBuilt to Support Serious B58 Power\u003c\/h3\u003e\n\u003cp data-end=\"3833\" data-start=\"3611\"\u003eWhether you’re building a strong street car or planning a higher-power setup, the Spool Performance BMW B58 Gen 1 Auxiliary Fuel System delivers the fueling control and capacity needed to push the platform with confidence.\u003c\/p\u003e\n\u003cp data-end=\"4075\" data-start=\"3835\"\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=\"4247\" data-start=\"4077\"\u003e\u003cstrong data-end=\"4247\" data-start=\"4077\"\u003eIf you’re ready to upgrade your B58 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=\"4252\" data-start=\"4249\"\u003e\n\u003ch3 data-end=\"4269\" data-start=\"4254\"\u003e\u003cstrong data-end=\"4269\" data-start=\"4258\"\u003eFitment\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"4367\" data-start=\"4271\"\u003eFits\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"4336\" data-start=\"4276\"\u003eall BMW vehicles equipped with the B58B30 engine (Gen 1)\u003c\/strong\u003e, including but not limited to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBMW M240i \/ M240i xDrive (F22 \/ F23) – 2016–2018\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul data-end=\"4793\" data-start=\"4369\"\u003e\n\u003cli data-end=\"4425\" data-start=\"4369\"\u003e\n\u003cp data-end=\"4425\" data-start=\"4371\"\u003eBMW 340i \/ 340i xDrive (F30 \/ F31 \/ F34) – 2016–2018\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4482\" data-start=\"4426\"\u003e\n\u003cp data-end=\"4482\" data-start=\"4428\"\u003eBMW 440i \/ 440i xDrive (F32 \/ F33 \/ F36) – 2016–2018\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote data-end=\"4940\" data-start=\"4795\"\u003e\n\u003cp data-end=\"4940\" data-start=\"4797\"\u003e\u003cstrong data-end=\"4806\" data-start=\"4797\"\u003eNote:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDesigned specifically for\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"4855\" data-start=\"4833\"\u003eB58 Gen 1 (B58B30)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eplatforms. Not compatible with B58 Gen 2 \/ B58TU systems unless otherwise specified.\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"Spool Performance","offers":[{"title":"Walbro 450 with check valves","offer_id":43085650559089,"sku":null,"price":1809.99,"currency_code":"CAD","in_stock":true},{"title":"Walbro 525 with check valves","offer_id":43085650591857,"sku":null,"price":2224.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1088\/6742\/files\/1_04e7ce7a-8576-4566-890b-f3b5ade17fea.webp?v=1774029632","url":"https:\/\/www.parkautomotorsports.ca\/products\/bmw-b58-gen1-auxiliary-split-fuel-system","provider":"Park Auto Motorsports","version":"1.0","type":"link"}