{"product_id":"bmw-b58-gen-2-spool-auxiliary-split-fuel-system","title":"BMW B58 Gen 2 Spool Auxiliary Split Fuel System","description":"\u003cp\u003eThe Spool B58 Gen 2 auxiliary fuel system gives your port injection its own fuel feed, separate from direct injection, for stable fueling as power climbs.\u003c\/p\u003e\u003ch2\u003eWhy you need it\u003c\/h2\u003e\u003cp\u003eWhen DI and port injection share one feed, the pulsing of the DI pump can upset fuel delivery to the port injectors, and port injection needs boost-referenced pressure to stay consistent under load. Splitting the two supplies lets each run exactly as intended, so fueling stays smooth and repeatable at higher boost.\u003c\/p\u003e\u003ch2\u003eFits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBMW M240i (B58 Gen 2)\u003c\/li\u003e\n\u003cli\u003eBMW M340i (B58 Gen 2)\u003c\/li\u003e\n\u003cli\u003eBMW M440i (B58 Gen 2)\u003c\/li\u003e\n\u003cli\u003eBMW 540i (B58 Gen 2)\u003c\/li\u003e\n\u003cli\u003eBMW X3 M40i and X4 M40i (needs a different in-tank bracket)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSeparate DI and port injection fuel supply\u003c\/li\u003e\n\u003cli\u003eDual Walbro 450 pumps standard, Walbro 525 upgrade available\u003c\/li\u003e\n\u003cli\u003eRetains the OEM top hat using machined aluminum fittings, no repinning\u003c\/li\u003e\n\u003cli\u003ePlug-and-play harness for the Reflex controller\u003c\/li\u003e\n\u003cli\u003eTriple-layer PTFE, stainless and nylon fuel lines\u003c\/li\u003e\n\u003cli\u003eRadium Engineering boost-referenced fuel pressure regulator\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eGood to know\u003c\/h2\u003e\u003cp\u003eChoose Walbro 450 or Walbro 525 pumps, both with check valves, at checkout. The 525 suits higher power goals. A solid-state relay option for full PWM pump control is sold separately and needs two harnesses per kit. The system is designed around a Reflex controller and needs a supporting tune. X3 M40i and X4 M40i need a different in-tank bracket, so confirm before ordering. Professional installation is recommended.\u003c\/p\u003e","brand":"Spool Performance","offers":[{"title":"Walbro 450 with check valves","offer_id":46564602183765,"sku":"SP-B58G2AUXF450","price":1499.99,"currency_code":"USD","in_stock":true},{"title":"Walbro 525 with check valves","offer_id":46564602216533,"sku":"SP-B58G2AUXF525","price":1799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0638\/9769\/8389\/files\/9_21447152-5da9-4077-9477-e57b6da91812.png?v=1793251076","url":"https:\/\/www.wrenchhaususa.com\/de\/products\/bmw-b58-gen-2-spool-auxiliary-split-fuel-system","provider":"Wrench Haus","version":"1.0","type":"link"}