{"product_id":"spool-bmw-b58-gen2-auxiliary-split-fuel-system","title":"Spool BMW B58 Gen 2 Auxiliary Split Fuel System","description":"\u003cdiv class=\"mlab-product-details\" style=\"line-height:1.65;max-width:100%\"\u003e\n\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\n\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\n\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\n\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\n\u003cp\u003e\u003cstrong\u003eDispatch:\u003c\/strong\u003e Special order — allow 3–4 weeks.\u003c\/p\u003e\n\u003ch3 style=\"border-bottom:1px solid #b99b5c;padding-bottom:8px;margin-top:24px\"\u003eConfirmed catalogue fitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine families:\u003c\/strong\u003e B58\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW chassis:\u003c\/strong\u003e G20, G21, G22, G23, G26, G01, G02\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle models:\u003c\/strong\u003e M340i, M440i, X3 M40i, X4 M40i\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"border-bottom:1px solid #b99b5c;padding-bottom:8px;margin-top:24px\"\u003eFuel-system selection and installation\u003c\/h3\u003e\n\u003cp\u003eFuel-system parts must be selected around the complete combination of engine generation, fuel type, target output, existing pump and injector configuration, and the calibration strategy. A component appearing for an engine family does not mean it replaces every factory or upgraded fuel-system arrangement used on that engine.\u003c\/p\u003e\n\u003cp\u003eProfessional installation and calibration are recommended where the product changes fuel pressure, pump control, injector flow, ethanol-content input or port-injection operation. Confirm wiring, plumbing, electrical load, controller requirements and compatible supporting hardware before ordering.\u003c\/p\u003e\n\u003ch3 style=\"border-bottom:1px solid #b99b5c;padding-bottom:8px;margin-top:24px\"\u003eBefore ordering\u003c\/h3\u003e\n\u003cp\u003eSelect your exact BMW through MLAB My Garage and review the product options, included parts and installation requirements. Where a vehicle has been modified from its original engine, transmission or fuel-system specification, contact MLAB with the VIN and current hardware list so the combination can be checked before supply.\u003c\/p\u003e\n\u003ch3 style=\"border-bottom:1px solid #b99b5c;padding-bottom:8px;margin-top:24px\"\u003eMLAB support\u003c\/h3\u003e\n\u003cp\u003eMLAB by Boost and Tune can assist with product selection, workshop installation and dyno calibration for supported BMW applications in Melbourne. Product availability and lead time should be confirmed when ordering supplier-built or special-order components.\u003c\/p\u003e\n\u003csection\u003e\u003ch3 style=\"border-bottom:1px solid #b99b5c;padding-bottom:8px;margin-top:24px\"\u003eSupplier specification \u0026amp; ordering notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeparate direct-injection and port-injection feeds reduce interaction between their pressure demands. The port-injection side uses boost-referenced regulation.\u003c\/li\u003e\n\u003cli\u003eThe system retains the factory pump top hat with machined fittings and supplies a Reflex-compatible harness. A billet top hat is optional.\u003c\/li\u003e\n\u003cli\u003eDual Walbro 450 pumps are the standard supplier configuration, with 525 upgrades available. Confirm the selected MLAB variant.\u003c\/li\u003e\n\u003cli\u003eThe optional full-PWM arrangement needs two separately supplied PWM harnesses per auxiliary fuel-system kit.\u003c\/li\u003e\n\u003cli\u003eThe included hoses use a PTFE core, stainless reinforcement and a nylon outer layer. A compact Spool regulator is included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Spool Performance","offers":[{"title":"Walbro 450 with check valves","offer_id":49973464105202,"sku":"SP-B58G2AUXF450","price":2830.0,"currency_code":"AUD","in_stock":true},{"title":"Walbro 525 with check valves","offer_id":49973464137970,"sku":"SP-B58G2AUXF525","price":3262.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0845\/4825\/5986\/files\/12.png?v=1787609987","url":"https:\/\/mlab-boostandtune.com\/products\/spool-bmw-b58-gen2-auxiliary-split-fuel-system","provider":"M Lab by Boost \u0026 Tune","version":"1.0","type":"link"}