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.
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  • Delivery to the USA:
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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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4.0 ★★★★★
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FeralCatLady
Houston, US
★★★★★ 5
Adorable!
Color: A White, Color: A White
I'm not sure what I saw in Mt mind's eye when I ordered this, but this was not it. HOWEVER, this little deer can't be more than 3.5 inches long and with it's over exaggerated antlers it actually makes the CUTEST little jewelry tree. As you can see I put studs thru the holes where the pairs are in symmetrical spots, but as my daughter said "it's kind of awkward that they aren't closer" But the studs I'll keep in place will be my least used, so it shouldn't be an issue. This little tree is made of very lightweight plastic which snapped together easily, but a big part of me hopes to someday find one a bit larger, made of ceramic. As my daughter said "it's by far the most creative one I've ever seen"
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2024
P
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Pam
Houston, US
★★★★★ 1
Not worth it
Color: A White
Cheap and flimsy, Fell over with my jewelry on it. Everything got tangled because eit wasn't spaced out. For anyone looking to buy it--dont. It may not be tall enough for your necklaces to dangle and not drag on the tray. However it is beautiful, would not buy again
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 2, 2023
L
Verified Purchase
Lili :)
Draper, US
★★★★★ 5
Great for college!
Color: A White, Color: A White
I am not one to decorate my room, but this really helps put vibes in it. Unfortunately, you cannot put a lot on this, but it is still good to put your everyday jewelry on. I find that I can only put two necklaces on the antlers because anymore it would get tangled. Earrings can be a little tricky to put in depending on what type of backing it has rings and bracelets. I usually put at the bottom of the tray and I don’t have problems with that.
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Reviewed in the United States on April 4, 2024
D
Verified Purchase
Deidra
Grantham, US
★★★★★ 5
Beautiful and Functional Desk Upgrade
Color: Pink Marble-31.5"x15.8"(with Wall Charger)
I absolutely love this Pink Marble Mouse Pad with 15W Wireless Charging. The design is beautiful, soft, and feminine without being too much, and it instantly makes my desk look more polished and organized. The large size is perfect because it gives me plenty of room for my keyboard, mouse, notebook, and other desk essentials while still keeping everything looking neat. The wireless charging feature is such a convenient bonus. I love being able to place my phone down and charge it while I work without having extra cords everywhere. The surface is smooth, my mouse glides easily, and the pad feels comfortable during long hours at my desk. Overall, this is a great mix of style and function. It is perfect for a home office, gaming setup, content creation space, or anyone who wants their desk to look cute and stay practical. Highly recommend!
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Reviewed in the United States on May 6, 2026
S
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StephTradesC8
San Leandro, US
★★★★★ 5
Works Well and Good Quality
Color: Black-Stock Market-31.5"x15.8"(with Wall Charger)
The recharging feature works well for both phone and earbuds. Phone charges very fast. Great looking mousepad that has ample size for both keyboard and mouse. Mouse moves easily on the surface and is much better than using it solely on a tabletop. Great price too!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 12, 2026

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