{"product_id":"bmw-b58-gen-1-spool-auxiliary-split-fuel-system","title":"BMW B58 Gen 1 Spool Auxiliary Split Fuel System","description":"\u003cp\u003eThe Spool auxiliary split fuel system for the Gen 1 B58 gives direct injection and port injection their own fuel supply for stable fueling at high power.\u003c\/p\u003e\u003ch2\u003eWhy you need it\u003c\/h2\u003e\u003cp\u003eWhen DI and PI share one feed, the pulsing of the direct injection system can upset flow to the port injectors, and the port side needs boost-referenced pressure to hold a consistent injector differential. Separating the two lets each system work as intended, for smoother, more repeatable fueling as boost goes up. The factory top hat is retained with machined aluminum fittings, so there is no repinning or factory wiring to modify.\u003c\/p\u003e\u003ch2\u003eFits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBMW M240i \u0026amp; M240i xDrive (F22\/F23), 2016 to 2018\u003c\/li\u003e\n\u003cli\u003eBMW 340i \u0026amp; 340i xDrive (F30\/F31\/F34), 2016 to 2018\u003c\/li\u003e\n\u003cli\u003eBMW 440i \u0026amp; 440i xDrive (F32\/F33\/F36), 2016 to 2018\u003c\/li\u003e\n\u003cli\u003eOther BMW with the Gen 1 B58B30 engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDual Walbro 450 or Walbro 525 fuel pumps with check valves (selected at checkout)\u003c\/li\u003e\n\u003cli\u003ePrecision-machined aluminum fittings for the factory top hat\u003c\/li\u003e\n\u003cli\u003ePlug-and-play wiring harness for the Reflex controller\u003c\/li\u003e\n\u003cli\u003eTriple-layer fuel lines: PTFE core, stainless reinforcement, nylon outer layer\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\u003eMade for the Gen 1 B58 (B58B30) only and not for Gen 2 \/ B58TU engines. The Walbro 450 pumps suit most builds; the 525 option is for higher power goals. For full PWM pump control, two Spool PWM activation harnesses are needed and are sold separately. A supporting tune is required. Professional installation is recommended.\u003c\/p\u003e","brand":"Spool Performance","offers":[{"title":"Walbro 450 with check valves","offer_id":46564602544213,"sku":"SP-B58G1AUXF450","price":1499.99,"currency_code":"USD","in_stock":true},{"title":"Walbro 525 with check valves","offer_id":46564602576981,"sku":"SP-B58G1AUXF525","price":1799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0638\/9769\/8389\/files\/3_1999ca40-16ac-4445-a59e-509961692026.png?v=1793251077","url":"https:\/\/www.wrenchhaususa.com\/de\/products\/bmw-b58-gen-1-spool-auxiliary-split-fuel-system","provider":"Wrench Haus","version":"1.0","type":"link"}