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Holley 550-511-5XR Sniper 2 Black 5 Inch Return Retrofit

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#4255505115XR

Holley 550-511-5XR Sniper 2 Black 5 Inch Return Retrofit

New for Sniper 2 is the optional Power Distribution Module (PDM). This cost-effective and optional accessory isolates the core of your EFI and ignition wiring into one, easy-to-use location. Simply slide the stripped wire ends under the positive lock connector and tighten down the set screw. Battery and a switched 12-volt source is all that's required from your vehicle to power the PDM and your Sniper EFI.

Finish / Type:

Black - Drop-In Fuel Module - Return

Black Black - Drop-In Fuel Module - Returnless Black - Inline Fuel Shiny Shiny - Drop-In Fuel Module - Return Shiny - Drop-In Fuel Module - Returnless Shiny - Inline Fuel

$1,933.95

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$2,149.95

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Product Summary

800 CFM CFM, 100 lb/hr @ 58.5 PSI Injector Size

New for Sniper 2 is the optional Power Distribution Module (PDM). This cost-effective and optional accessory isolates the core of your EFI and ignition wiring into one, easy-to-use location. Simply slide the stripped wire ends under the positive lock connector and tighten down the set screw. Battery and a switched 12-volt source is all that's required from your vehicle to power the PDM and your Sniper EFI.
All new design – the #1 EFI Conversion just got better!
Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
Supports up to 650hp naturally aspirated or 575hp on boost with four 100 lb/hr injectors
(NEW) Redesigned throttle shaft and plate geometry for a smoother throttle feel

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Key Specs

MFG. Part #	550-511-5XR
Brand	Holley Sniper
CFM	800 CFM
Injector Size	100 lb/hr @ 58.5 PSI
Max Horsepower Rating	650

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Holley Sniper 550-511-5XR Details

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.

New for Sniper 2 is the optional Power Distribution Module (PDM). This cost-effective and optional accessory isolates the core of your EFI and ignition wiring into one, easy-to-use location. Simply slide the stripped wire ends under the positive lock connector and tighten down the set screw. Battery and a switched 12-volt source is all that's required from your vehicle to power the PDM and your Sniper EFI.

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.

Main Features

All new design – the #1 EFI Conversion just got better!

Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM

Calibration wizard only requires that you answer a few simple questions about your engine to create a base map and begin self-tuning – No laptop required

Supports up to 650hp naturally aspirated or 575hp on boost with four 100 lb/hr injectors

(NEW) Next generation ECU features improved RF noise and interference resistance (stands up to old car wiring, noisy alternators, faulty plug wires)

(NEW) Redesigned throttle shaft and plate geometry for a smoother throttle feel

Sniper 2 is Part of 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

(NEW) Main harness includes plug-and-play HyperSpark distributor support, for integrated timing control, making your ignition setup hassle free

(NEW) Adaptors for other ignition types sold separately: 558-329 CD Box to Sniper 2, 558-330 MSD Pro Billet / Crank Trigger to Sniper 2

(NEW) Wide Variety of tuning and gauge display interfaces: from a 3.5-inch full color LCD Handheld, 5-inch Digital Dash, or the Bluetooth dongle, which allows you to connect either an iOS or Android based cell phone to your Sniper 2

(NEW) Optional Power Distribution Module (PDM) further simplifies wiring, especially when used in conjunction with an ignition system

Available with fuel system kits: a complete fuel system consisting of: 20 ft. of 3/8 in. Vapor Guard Fuel Hose, Fuel Pump, fuel pressure regulator, filters, necessary hardware, and bulkhead fitting to return fuel into the tank

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

The included genuine Bosch LSU 4.9 wideband oxygen Sensor provides real-time fuel map learning

Included 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

Patent Pending

Nitrous Control Not Supported In Sniper 2 EFI Software

Rebates

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 use on pre-1966 vehicles only

Emissions warning: this part only legal for sale or use in California 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

CARB warning

Holley Sniper 550-511-5XR Specifications

KEY SPECS
MFG. Part #	550-511-5XR
Brand	Holley Sniper
CFM	800 CFM
Injector Size	100 lb/hr @ 58.5 PSI
Max Horsepower Rating	650

GENERAL
User Tunable	Yes
Self Tuning	Yes
Injectors Included	Yes
Intake Manifold Included	No
Fuel Pump Included	Yes
Fuel Pressure Regulator Included	Yes
Distributor Included	No
Finish	Ceramic
Overall Height	3.28"
GTIN Code	00090127863374
Sold in Quantity	Each

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