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Holley 550-511-3AE Sniper 2 EFI Upgrade Kit W/ Regulator, Black

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#42555511-BLK

Holley 550-511-3AE Sniper 2 EFI Upgrade Kit W/ Regulator, Black

Name: Holley 550-511-3AE Sniper 2 EFI Upgrade Kit W/ Regulator, Black
Brand: Holley
SKU: 42555511-BLK
Price: 1168.95 USD
Availability: InStock
Rating: 4 (1 reviews)

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Update your Sniper EFI to the new, improved Sniper 2 in less than one hour!
Eliminates the need to rewire your existing Sniper EFI installation - one step, plug and play upgrade to a Sniper 2 throttle body
Improve your ride with the benefits of Sniper 2, including wireless connectivity, smoother throttle feel, improved RF interference resistance, hidden wiring harness and more

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Product Summary

Update your Sniper EFI to the new, improved Sniper 2 in less than one hour!
Eliminates the need to rewire your existing Sniper EFI installation - one step, plug and play upgrade to a Sniper 2 throttle body
Improve your ride with the benefits of Sniper 2, including wireless connectivity, smoother throttle feel, improved RF interference resistance, hidden wiring harness and more
Reuses existing coolant temperature and wideband oxygen sensors
Supports up to 650hp naturally aspirated or 575hp on boost with four 100 lb/hr injectors

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Key Specs

MFG. Part #	550-511-3AE
Brand	Holley

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Holley 550-511-3AE Details

Want to make the switch from the original Sniper EFI to Sniper 2 and don't want to rewire your system? The new Sniper 2 upgrade kits are designed to do exactly that! Included with each Sniper 2 Plug and Play upgrade system is an adapter solution that connects your existing Sniper EFI wiring harness to a Sniper 2 throttle body in minutes. Simply remove your Sniper EFI throttle body from the intake manifold, unplug all connectors, reinstall the Sniper 2 throttle body, and plug the Sniper EFI 2 adapter harness into your existing main harness. Cycle your ignition key, run a fresh wizard on the display of your choice, and enjoy the benefits of Sniper 2 EFI. The #1 EFI conversion system just got better! Introducing Sniper 2 EFI - a self-tuning, easy-to-install, EFI conversion for common 4-barrel (4150 flange) style carburetors. We took everything that we learned from the original Sniper EFI system and added 14 new features that will make your EFI conversion more simple, reliable, and modern. Like all Sniper EFI systems, Sniper 2 is designed to work with the Sniper Ecosystem that includes Hyperspark ignition, complete fuel systems, multiple user interfaces/dash displays, and more. Make your classic drive like a modern fuel injected vehicle, including easy cold starts, smooth drivability, and improved fuel economy! Sniper 2 is designed to be installed at home in your garage with limited tools and the support of Holley's comprehensive installation manual and videos. The user-friendly setup wizard allows you to answer a few simple questions about your engine and the system will begin self-tuning with no laptop or tuning experience required. If you're looking for a high-performance fuel injection system that delivers power, efficiency, and ease of use, look no further than the Sniper 2 EFI.

Features:

Main Features
Update your Sniper EFI to the new, improved Sniper 2 in less than one hour!
Eliminates the need to rewire your existing Sniper EFI installation - one step, plug and play upgrade to a Sniper 2 throttle body
Improve your ride with the benefits of Sniper 2, including wireless connectivity (coming late 2023), smoother throttle feel, improved RF interference resistance, hidden wiring harness and more
Four total kits available – polished and black, with or without external fuel pressure regulator (required for Sniper 2)
Reuses existing coolant temperature and wideband oxygen sensors
All new design – the #1 EFI Conversion just got better!
Supports up to 650hp naturally aspirated or 575hp on boost with four 100 lb/hr injectors
Next generation ECU features improved RF noise and interference resistance (stands up to old car wiring, noisy alternators, faulty plug wires)
Redesigned throttle shaft and plate geometry for a smoother throttle feel
Sniper 2 is Part of the Sniper EFI Complete Ecosystem
Sniper 2 is compatible with the complete Sniper EFI Ecosystem that includes plug-n-play Hyperspark Ignition systems (coil, ignition box and distributor), fuel systems (fuel lines, fuel pump hangers), multiple displays and more
Available with fuel system kits: that include an adjustable external regulator, fittings, and a 3’ section of fuel hose, allowing you to easily mount your regulator in the engine bay
Additional Features
(NEW) Integrated transmission kick down provisions for GM TH350/400, 200-4R/700R4 and Ford C4/C6 applications
(NEW) “Hidden Harness” wiring harnesses exits from the rear of throttle body for a clean appearance
(NEW) Inputs and outputs consist of: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5v), and 1x Tach Output
(NEW) Redesigned injector connector for improved reliability
(NEW) Onboard contactless magnetic TPS sensor ensures an accurate TPS reading
(NEW) Next Generation mil-spec style M8 positive lock connector for CAN1 and CAN2 provides the latest in CAN bus technology for a simple yet robust connection
(NEW) Cast-in fuel crossover from the primary to secondary fuel rail
(NEW) Sniper 2 throttle bodies are serialized in house, which provides each unit a birth certificate for an improved customer service and warranty experience in the event of any unit needing to be inspected
Patent Pending

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Holley Fuel Up Spring Savings Event 2026

Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period runs from March 30, 2026 through April 19, 2026.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

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Holley 550-511-3AE Specifications

KEY SPECS
MFG. Part #	550-511-3AE
Brand	Holley

GENERAL
GTIN Code	090127843642

Ratings & Reviews

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It is a upgrade over sniper 1.

4.0

8 months ago

Corvette Bob

Iowa

Verified

Forgot to tell me I needed a pressure gauge.

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