SKU: 39366981107

Holley Sniper EFI XFLow 4BBL Self Tuning System - Black Ceramic (HO550-541)

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Description

Holley Sniper EFI XFLow 4BBL Self Tuning System - Black Ceramic (HO550-541)HO550 541 HOLLEY SNIPER EFI BLACK 800HP 900 cfm 4 Injector Throttle Body, 800 HP N A Part Number: HO550 541 Introducing Sniper EFI XFlow! Are you building a naturally aspirated engine up to 800 Horsepower? Looking to convert your blow through carbureted turbo engine to EFI? Look no further! The Sniper EFI XFlow from Holley features 4, 120LB HR Fuel Injectors and flows 900CFM allowing it safely supporting up to 800 HP on Naturally Aspirated engines.

HO550-541 - HOLLEY SNIPER EFI BLACK 800HP

900 cfm 4 Injector Throttle Body, 800 HP N/A

Part Number: HO550-541

Introducing Sniper EFI XFlow! Are you building a naturally aspirated engine up to 800 Horsepower? Looking to convert your blow through carbureted turbo engine to EFI? Look no further! The Sniper EFI XFlow from Holley features 4, 120LB/HR Fuel Injectors and flows 900CFM allowing it safely supporting up to 800 HP on Naturally Aspirated engines. The XFlow comes with an internal 2.5bar MAP sensor that will safely work on boosted applications up to 21.5 psi. For applications making more than 21.5 psi, and has three additional 0-5v Sensor Inputs which can be used for an external MAP Sensor, or Dome Pressure for boost control, as well as oil pressure and fuel pressure. An External Fuel Pressure regulator is required; we recommend part number 12-848 for N/A applications.
Features:
Supports up to 800HP N/A with 4 120 Lb/Hr Injectors
Flows 900CFM, making it perfect for high rpm N/A engine combinations
Compatibl e 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
Programm able 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
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

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Exchange/Return Notes
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SKU: 39366981107

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R. D. Morris
West Palm Beach, US
★★★★★ 4
If you liked 1491, you'll like 1493
Format: Hardcover
I originally read the first edition of 1491, which I loved. So that's why I ordered 1493. At about the same time 1493 arrived, I found out there was a new, revised version of 1491, which my husband bought from another source. So I re-read it at the same time I read 1493 for the first time. The reason I mention this is that there are some similarities between the revised version of 1491 and the newer book, 1493 - actually some repeated material. That's ok, as the author is taking the premise of 1491 another step further. Essentially, 1491 focuses on what new studies show was really going on in the Western Hemisphere before Columbus' arrival, where native peoples were far more numerous and had more advanced cultures than Europeans previously thought possible. In 1493, Charles Mann shows not only how Columbus and Europeans changed the New World, but how the "Columbian exchange" wrought great changes in the other direction as well. And he pulls in the further exchanges with Asia, to show the trans-global linkages of the phenomenon. So, some of his exposition gets a little repetitious, but overall he's an engaging writer, and for those of us who love the history of cultural exchanges and first contact, these books are mandatory reading!
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Reviewed in the United States on October 5, 2011
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Ian T
Massapequa, US
★★★★★ 5
Truly worth every penny. DS2r?
Format: Hardcover
Truly incredible documentation of the thoughtful work of a handful of artists. I'm hoping that by supporting this book we may inch ourselves closer to a Dead Space 2 remake lead by Motive studio. This book is a must for fans or the game and horror in general. Well made, good quality images, lore drops, developer letters. Its fantastic!
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Reviewed in the United States on May 15, 2025
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Amazon Customer
Natrona Heights, US
★★★★★ 5
Nice art
Format: Hardcover
The art is good and I love the comparisons to the og
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Reviewed in the United States on October 12, 2025
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S U
Natrona Heights, US
★★★★★ 5
Great Art Book
Format: Hardcover, Format: Hardcover
One of my all time favorite games, this was perfect. It IS an art book, so more into the visuals then descriptions or thoughts on designs, but that's about what I expected. Especially as it's more for the remake than original. But still worth every cent, great to see the details (especially things that are tough to see in-game) and small descriptions. Arrived quicky and in perfect condition, no complaints at all!
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Reviewed in the United States on July 16, 2025
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Mario Castellanos
Houston, US
★★★★★ 5
Love it.
Format: Hardcover
Art book is amazing!
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