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Holley Sniper XFLOW 800 - Gold Finish


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Holley Sniper XFLOW 800 - Gold Finish


  • Supports up to 800HP N/A or 690HP Forced Induction with 4x 120 Lb/Hr Injectors
  • Flows 900CFM, making it perfect for high rpm N/A engine combinations
  • Compatible with Draw through or Blow through forced induction applications
  • 2.5Bar MAP Sensor
  • Integrated ignition timing control
  • Built in Single stage progressive nitrous control
  • User friendly Boost Control with handheld adjustability
  • Programmable Target Air Fuel Ratios per Boost level
  • Advanced boost control available via free Sniper EFI tuning software, including Boost vs RPM and Boost vs Time.
  • Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure Sensors
  • Six Programmable Ground Outputs
  • One +5v Reference Output - +5V Power Supply for 0-5v Sensors
  • One Sensor Ground – Ground supply for 0-5v Sensors
  • Dual Pattern bolt on carburetor replacement, designed to fit 4150 Flange & Spread Bore manifolds - (Spread Bore Sealing Plate Part #9006 is recommended)
  • Throttle body mounted ECU – no extra boxes to mount
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
  • Requires an external fuel pressure regulator: P/N 12-848 up to 800 HP or 12-851 for 1000+ HP.
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Simple Calibration Wizard (Answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn!
  • OEM Style TPS/IAC and Fuel Pressure regulator, for years of dependable service.
  • Included 2.5” clamp-on oxygen sensor kit ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange

Every Sniper EFI Throttle Body that ships from Steve Morris Engines is tested on our in house run stand to guarantee functionality before going to our customers.

NOTE:  When ordering this EFI system, please make sure you have the proper fuel pump, boost-referenced pressure regulator, carb hat, etc.  In the pull-down menu below, we recommend the HOLLEY regulator and fuel pump as seen here:

Part #: 550-542

Price: $1,299.95
Please Call for Availability !
Add SME Boosted Calibration? MUST SHIP FROM SME:
Add Second Calibration?:
Add complete fuel system including regulator, filters and fittings?:
Add SME 4150 carb hat?:

Engine Type (BBC, SBC, LS, etc) *

Engine Displacement? *

Max Engine RPM? *

Enter Camshaft Details *

Do you want the SNIPER to control engine timing? (MUST USE MSD BOX or Hyperspark box!) *

What Power Adder Are You Using? *

Max Boost? *

Which ignition box? *

Is it intercooled? *


Product Q & A

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