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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Verified Purchase
Did not contain 5 pieces as indicated in post however the hardware is as described
Fort Morgan, US
★★★★★ 5
Terrific product
Size: 1.7 Fl Oz (Pack of 2)
Love the texture, not greasy or thick.. works great under my makeup as well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
B
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Brook Riley
Bozeman, US
★★★★★ 4
Irritated skin and too expensive
Size: 1.7 Ounce (Pack of 1)
It’s a good sunscreen. I like the smell and the consistency. However, I live in Denver, CO and it didn’t seem to protect my skin as much as I would like. It also eventually started drying out my skin and gave me a small rash that cleared up as soon as I stopped using it. This could be my personal experience, but it was too expensive and too small of a tube for me to justify continuing use.
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Reviewed in the United States on May 8, 2026
S
Verified Purchase
Seana N.
Louisville, US
★★★★★ 5
Dewy and Effective Finish
Size: 1.7 Ounce (Pack of 1)
I recently started using the Cocoonkind SPF, and I’m really impressed with this product! It provides excellent sun protection without the greasy or heavy feeling that some sunscreens can leave behind. The formula is lightweight and absorbs quickly into my skin, leaving it feeling soft and hydrated. I also love that it’s made with clean, natural ingredients—knowing that it’s cruelty-free and free of harmful chemicals gives me peace of mind. The finish is dewy but not shiny, making it perfect for daily use under makeup or on its own. I’ve been using it every day, and it’s become a staple in my skincare routine. If you’re looking for a clean, effective sunscreen that provides great protection while nourishing your skin, I highly recommend Cocoonkind SPF! It’s gentle, effective, and perfect for all skin types.
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Reviewed in the United States on January 11, 2025
C
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christian
Lexington, US
★★★★★ 3
White cast
Size: 1.7 Ounce (Pack of 1)
Has a white cast on brown skin, works okay under makeup
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Reviewed in the United States on April 21, 2026
L
Verified Purchase
L. Tobin
West Palm Beach, US
★★★★★ 5
So far, so good!
Size: 1.7 Ounce (Pack of 1)
It rubs in clear very nicely and doesn’t feel greasy or heavy on my skin.
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Reviewed in the United States on April 24, 2026

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