SKU: 39366981107

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

Sale price$1750.95 Regular price$1945.50
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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

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 39366981107

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Joe Goob
Belleville, US
★★★★★ 5
Very nice
Good price
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Reviewed in the United States on January 26, 2026
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Coffee Customer
Battle Creek, US
★★★★★ 5
Amazing lotion for the low price.
Size: 20.3 Fl Oz (Pack of 1)
Great everyday lotion and an excellent value for the price. The texture is light and creamy, not greasy, and it absorbs quickly. I like the scent, though scent preference is personal. Shipping was fast. The only downside is the pump—it was difficult to open and required turning it counterclockwise, then clockwise, which was more effort than it should have been. Once it popped up, it works perfectly.
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Reviewed in the United States on January 25, 2026
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mia lia
Battle Creek, US
★★★★★ 5
Best non greasy moisturizing lotion ever!!
Size: 20.3 Fl Oz (Pack of 1), Size: 20.3 Fl Oz (Pack of 1)
This lotion is honestly probably one of the best lotions I’ve ever used. I used it for the first time today immediately after my shower and it’s the perfect consistency not too thick or thin.. not full of water either which is good because my skin absorbs instantly! Most lotions sit on my skin and make me greasy and sweaty afterwards. It also smells like HEAVEN. Chocolaty and a hint of vanilla! I won’t be buying any other lotion this now!
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Reviewed in the United States on April 14, 2026
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Karly P.
Boise, US
★★★★★ 4
Great moisturizer
Size: 20.3 Fl Oz (Pack of 1), Size: 20.3 Fl Oz (Pack of 1)
This cream is a great alternative to the more expensive name brand creams. I have ordered this a few times and I feel like it does a wonderful job keeping my skin feeling soft, nourished and moisturized until the next time I shower. I do not feel as though my skin is greasy or oily after using this product. The cream does not feel thick or heavy on my skin. I am able to put a pair of pants on comfortably after using cream without feeling sticky. The cocoa butter scent is light and not over powering. There are parts of my body that I have to avoid with the cream because I do have eczema, but this is something I have grown up with and I am used to. I have purchased the cream twice, and unfortunately, the second time I bought it the pump top came a little bit destroyed (shown in photo). The product is still fully functional and will not determine from buying this again in the future!
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Reviewed in the United States on May 14, 2026
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Chillbilly
New York, US
★★★★★ 5
Satisfied
Size: 20.3 Fl Oz (Pack of 1)
Great value. Lotion is non greasy - fast absorbing and will last thru handwashing, leaves skin revitalized and soft. The smell is not as pleasant as I would like and the bottle's size makes pumping difficult. But all in all it was a good buy and worth the cons.
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Reviewed in the United States on April 11, 2026

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