{"product_id":"holley-terminator-x-stealth-4150-gm-ls-58x-550-1061","title":"Holley Terminator X Stealth 4150, GM LS 58x | 550-1061","description":"\u003cp\u003eThe Terminator X Stealth 4150 EFI system bolts on as a carburetor replacement for GM LS engines and features four 100 lb\/hr fuel injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction. Built for 58x crank reluctor LS engines, the self-learning Terminator X ECU delivers plug-and-play ignition timing control with factory LS coil sub-harnesses and OEM LS coils — no external boxes or modules needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTerminator X Stealth 4150 kit for 58x LS engines\u003c\/li\u003e\n\u003cli\u003eSupports up to 650 HP with four 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eTerminator X Max versions provide plug-and-play transmission control for GM 4L60\/4L80\u003c\/li\u003e\n\u003cli\u003eInternal 1bar MAP sensor built into the ECU\u003c\/li\u003e\n\u003cli\u003eAll wiring exits below the fuel injector bowls for a stealth installation\u003c\/li\u003e\n\u003cli\u003eAir entry machined to fit most stock-style air cleaners\u003c\/li\u003e\n\u003cli\u003eRequires an external fuel pressure regulator set to 58.5 PSI base (such as Holley 12-886)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play ignition timing control with factory LS coil sub-harness and OEM LS coils — Coil Near Plug, no external modules\u003c\/li\u003e\n\u003cli\u003eHigh-resolution full color touchscreen handheld for setup, tuning, and gauge displays\u003c\/li\u003e\n\u003cli\u003eSimple calibration wizard builds a base map from basic engine questions — no laptop required\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for sensors, nitrous activation, or trans brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs (ground, PWM) for fans, boost control, nitrous control, IAC\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor for real-time fuel map learning\u003c\/li\u003e\n\u003cli\u003eOEM-style TPS\/IAC for long-term reliability\u003c\/li\u003e\n\u003cli\u003eCompatible with Holley EFI digital dashes, gauges, and fuel system accessories\u003c\/li\u003e\n\u003cli\u003eAvailable in Shiny, Black, and Gold finishes\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Size\/Style: 4150 Squarebore\u003c\/li\u003e\n\u003cli\u003eCFM: 950\u003c\/li\u003e\n\u003cli\u003eThrottle Bore: 1.75 in.\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eInlet\/Outlet Size: 6 AN\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1 bar (internal)\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS, 58x crank reluctor\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes\u003c\/li\u003e\n\u003cli\u003eFinish: Black\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-1061\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRequires an external fuel pressure regulator (such as Holley 12-886) set to a base pressure of 58.5 PSI.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat crank trigger does this kit support?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS engines with a 58x crank reluctor.\u003c\/p\u003e\u003ch5\u003eHow much horsepower can this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 HP naturally aspirated or 600 HP on forced induction, using the included four 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDoes it require external ignition boxes?\u003c\/h5\u003e\u003cp\u003eNo — ignition control is plug-and-play with the factory LS coil sub-harness and OEM LS coils.\u003c\/p\u003e\u003ch5\u003eDo I need an external fuel pressure regulator?\u003c\/h5\u003e\u003cp\u003eYes, an external regulator set to 58.5 PSI base pressure is required, such as Holley part 12-886.\u003c\/p\u003e\u003ch5\u003eDoes it support transmission control?\u003c\/h5\u003e\u003cp\u003eTerminator X Max versions of this kit provide plug-and-play transmission control for GM 4L60\/4L80 transmissions.\u003c\/p\u003e\u003ch5\u003eWhat finish options are available?\u003c\/h5\u003e\u003cp\u003eShiny, Black, and Gold.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What crank trigger does this kit support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS engines with a 58x crank reluctor.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower can this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 HP naturally aspirated or 600 HP on forced induction, using the included four 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it require external ignition boxes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — ignition control is plug-and-play with the factory LS coil sub-harness and OEM LS coils.\"}},{\"@type\":\"Question\",\"name\":\"Do I need an external fuel pressure regulator?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, an external regulator set to 58.5 PSI base pressure is required, such as Holley part 12-886.\"}},{\"@type\":\"Question\",\"name\":\"Does it support transmission control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Terminator X Max versions of this kit provide plug-and-play transmission control for GM 4L60\/4L80 transmissions.\"}},{\"@type\":\"Question\",\"name\":\"What finish options are available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Shiny, Black, and Gold.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589106224,"sku":"GVMR_550-1061","price":2249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-1002_x-collage.jpg?v=1758385890","url":"https:\/\/berryperformancesales.com\/products\/holley-terminator-x-stealth-4150-gm-ls-58x-550-1061","provider":"Berry Performance Sales","version":"1.0","type":"link"}