{"product_id":"spool-bmw-b58-gen2-auxiliary-split-fuel-system","title":"Spool BMW B58 Gen 2 Auxiliary Split Fuel System","description":"\u003cp\u003e\u003cstrong\u003eSpool BMW B58 Gen 2 Auxiliary Split Fuel System\u003c\/strong\u003e separates the direct-injection and port-injection fuel feeds for more stable, boost-referenced fueling on higher-output BMW B58 builds.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDual Walbro 450 pumps supplied as the base configuration\u003c\/li\u003e\n\u003cli\u003eOptional dual Walbro 525 configuration for higher fuel demand\u003c\/li\u003e\n\u003cli\u003eOEM fuel-pump top-hat integration using precision-machined fittings\u003c\/li\u003e\n\u003cli\u003ePlug-and-play ReFlex controller compatibility\u003c\/li\u003e\n\u003cli\u003eTriple-layer PTFE fuel plumbing with stainless reinforcement\u003c\/li\u003e\n\u003cli\u003eCompact boost-referenced Spool fuel-pressure regulator\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e BMW B58 Gen 2 applications listed by Spool: M340i\/M340i xDrive 2020+, M440i\/M440i xDrive 2021+, X3 M40i 2020+ and X4 M40i 2020+.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Spool's solid-state PWM relay harness is a separate option. Confirm pump choice, port-injection controller, injector size and base pressure with the tuner.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDispatch:\u003c\/strong\u003e Special order — allow 3–4 weeks.\u003c\/p\u003e\u003ch2\u003eSupplier\u003c\/h2\u003e\u003cp\u003eSpool Performance\u003c\/p\u003e\u003ch2\u003eProduct System\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eFuel System\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBMW 340I M340I G20 G21 B58\u003c\/li\u003e\n\u003cli\u003eBMW 4 Series G22 B58\u003c\/li\u003e\n\u003cli\u003eBMW 4 Series G23 B58\u003c\/li\u003e\n\u003cli\u003eBMW 4 Series Gran Coupe G26 B58\u003c\/li\u003e\n\u003cli\u003eBMW X3 G01 B58\u003c\/li\u003e\n\u003cli\u003eBMW X4 G02 B58\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eAvailable Options\u003c\/h2\u003e\u003ch3\u003ePump\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eWalbro 450 with check valves\u003c\/li\u003e\n\u003cli\u003eWalbro 525 with check valves\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSupplier Part Numbers\u003c\/h2\u003e\u003cp\u003eSP-B58G2AUXF450, SP-B58G2AUXF525\u003c\/p\u003e\u003ch2\u003eBuilt by Boost \u0026amp; Tune Support\u003c\/h2\u003e\u003cp\u003eBBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.\u003c\/p\u003e","brand":"Spool Performance","offers":[{"title":"Walbro 450 with check valves","offer_id":43748864196675,"sku":"SP-B58G2AUXF450","price":2830.0,"currency_code":"AUD","in_stock":true},{"title":"Walbro 525 with check valves","offer_id":43748864229443,"sku":"SP-B58G2AUXF525","price":3262.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/9_21447152-5da9-4077-9477-e57b6da91812.png?v=1788516995","url":"https:\/\/builtbyboostandtune.com.au\/products\/spool-bmw-b58-gen2-auxiliary-split-fuel-system","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}