
Holley 550-511-3XK Sniper 2 EFI 650 HP Inline Pump Kit, Black
Holley designed this 550-511-3XK Sniper 2 EFI as a self-tuning, easy-to-install, EFI conversion for common 4 barrel (4150 flange) style carburetors. They took everything learned from the original Sniper EFI system and added 14 new features to make your EFI conversion more simple, reliable, and modern. It 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! Designed for installation at home in your garage with limited tools and support of Holley's comprehensive installation manual and videos. The user-friendly calibration wizard only requires answering a few simple engine questions to create a base map and begin self-tuning. No laptop or tuning experience required!
Looking for a high performance fuel injection system that delivers power, efficiency, as well as ease of use? Look no further than the Sniper 2 EFI!
Main Features:
- 20 feet of 3/8 in. Vapor Guard Fuel Hose, Fuel Pump, Fuel Pressure Regulator, Filters, necessary hardware as well as a bulkhead fitting to return fuel into the tank
- Only four wiring connections required: Battery+, Battery-, Switched Ignition, as well as RPM
- Next generation ECU features improved RF noise and interference resistance (old car wiring, noisy alternators, faulty plug wires)
- Redesigned throttle shaft as well as plate geometry for smoother throttle feel
- Compatible with complete Sniper EFI Ecosystem that includes plug-n-play Hyperspark Ignition systems (coil, ignition box, distributor), fuel systems (fuel lines, fuel pump hangers), multiple displays and more
- Main harness includes plug-and-play HyperSpark distributor support, for integrated timing control, making ignition setup hassle-free
- Wide Variety of tuning and gauge display interfaces from a 3.5-inch full color LCD Handheld, 5-inch Digital Dash, or Bluetooth dongle, allowing connection of either iOS or Android based cell phone to your Sniper 2
- Integrated transmission kick down provisions for GM TH350/400, 200-4R/700R4 as well as Ford C4/C6 applications
- “Hidden Harness” wiring harnesses exits from throttle body rear for clean appearance
- Inputs and outputs include: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5v), as well as 1x Tach Output
- Redesigned injector connector for improved reliability
- Onboard contactless magnetic TPS sensor ensures accurate TPS reading
- Next Generation mil-spec style M8 positive lock connector for CAN1 and CAN2. This provides the latest in CAN bus technology for simple yet robust connection
- Cast-in fuel crossover from primary to secondary fuel rail
- Throttle body serialized in-house, providing each unit a birth certificate for improved customer service as well as warranty experience
- Included genuine Bosch LSU 4.9 wideband oxygen Sensor provides real-time fuel map learning
- Included clamp-on oxygen sensor kit ensures leak free oxygen sensor installation with stainless steel T-Bolt clamps and stainless steel weldable oxygen sensor flange
Holley 550-511-3XK Sniper 2 EFI Kit Additional Features:
- Fuel Injection Type: Throttle Body
- Flange Style: 4150 Square Bore
- Maximum Horsepower with Gasoline: 650
- Airflow Rate: 800 CFM
- Metering Style: Speed Density
- Throttle Body Material: Cast Aluminum
- Throttle Body Color: Black Powdercoat
- Fuel Injector Size: 100 lb/hr
- Venturi Quantity: 4
- Power Distribution Module Included: No
- Display Included: Yes (3.5 in.)
- Self Tuning: Yes
- User Tunable: Yes
- Fuel Pump Included: Yes
- Fuel Pressure Regulator Included: Yes
- MAP Sensor Included: Yes
- IAT Sensor Included: Yes
- TPS Sensor Included: Yes
- IAC Motor Included: Yes
- Quantity: Sold as a kit
Notes: External inline pump and fuel plumbing kit included. Adaptors for other ignition types also sold separately: 558-329 CD Box to Sniper 2, 558-330 MSD Pro Billet / Crank Trigger to Sniper 2
Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, as well as intake manifolds and much more. From start to finish, Holley has the parts to make your dream a reality!
Original: $1,799.95
-65%$1,799.95
$629.98More Images





Holley 550-511-3XK Sniper 2 EFI 650 HP Inline Pump Kit, Black
Holley designed this 550-511-3XK Sniper 2 EFI as a self-tuning, easy-to-install, EFI conversion for common 4 barrel (4150 flange) style carburetors. They took everything learned from the original Sniper EFI system and added 14 new features to make your EFI conversion more simple, reliable, and modern. It 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! Designed for installation at home in your garage with limited tools and support of Holley's comprehensive installation manual and videos. The user-friendly calibration wizard only requires answering a few simple engine questions to create a base map and begin self-tuning. No laptop or tuning experience required!
Looking for a high performance fuel injection system that delivers power, efficiency, as well as ease of use? Look no further than the Sniper 2 EFI!
Main Features:
- 20 feet of 3/8 in. Vapor Guard Fuel Hose, Fuel Pump, Fuel Pressure Regulator, Filters, necessary hardware as well as a bulkhead fitting to return fuel into the tank
- Only four wiring connections required: Battery+, Battery-, Switched Ignition, as well as RPM
- Next generation ECU features improved RF noise and interference resistance (old car wiring, noisy alternators, faulty plug wires)
- Redesigned throttle shaft as well as plate geometry for smoother throttle feel
- Compatible with complete Sniper EFI Ecosystem that includes plug-n-play Hyperspark Ignition systems (coil, ignition box, distributor), fuel systems (fuel lines, fuel pump hangers), multiple displays and more
- Main harness includes plug-and-play HyperSpark distributor support, for integrated timing control, making ignition setup hassle-free
- Wide Variety of tuning and gauge display interfaces from a 3.5-inch full color LCD Handheld, 5-inch Digital Dash, or Bluetooth dongle, allowing connection of either iOS or Android based cell phone to your Sniper 2
- Integrated transmission kick down provisions for GM TH350/400, 200-4R/700R4 as well as Ford C4/C6 applications
- “Hidden Harness” wiring harnesses exits from throttle body rear for clean appearance
- Inputs and outputs include: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5v), as well as 1x Tach Output
- Redesigned injector connector for improved reliability
- Onboard contactless magnetic TPS sensor ensures accurate TPS reading
- Next Generation mil-spec style M8 positive lock connector for CAN1 and CAN2. This provides the latest in CAN bus technology for simple yet robust connection
- Cast-in fuel crossover from primary to secondary fuel rail
- Throttle body serialized in-house, providing each unit a birth certificate for improved customer service as well as warranty experience
- Included genuine Bosch LSU 4.9 wideband oxygen Sensor provides real-time fuel map learning
- Included clamp-on oxygen sensor kit ensures leak free oxygen sensor installation with stainless steel T-Bolt clamps and stainless steel weldable oxygen sensor flange
Holley 550-511-3XK Sniper 2 EFI Kit Additional Features:
- Fuel Injection Type: Throttle Body
- Flange Style: 4150 Square Bore
- Maximum Horsepower with Gasoline: 650
- Airflow Rate: 800 CFM
- Metering Style: Speed Density
- Throttle Body Material: Cast Aluminum
- Throttle Body Color: Black Powdercoat
- Fuel Injector Size: 100 lb/hr
- Venturi Quantity: 4
- Power Distribution Module Included: No
- Display Included: Yes (3.5 in.)
- Self Tuning: Yes
- User Tunable: Yes
- Fuel Pump Included: Yes
- Fuel Pressure Regulator Included: Yes
- MAP Sensor Included: Yes
- IAT Sensor Included: Yes
- TPS Sensor Included: Yes
- IAC Motor Included: Yes
- Quantity: Sold as a kit
Notes: External inline pump and fuel plumbing kit included. Adaptors for other ignition types also sold separately: 558-329 CD Box to Sniper 2, 558-330 MSD Pro Billet / Crank Trigger to Sniper 2
Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, as well as intake manifolds and much more. From start to finish, Holley has the parts to make your dream a reality!
Product Information
Product Information
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Description
Holley designed this 550-511-3XK Sniper 2 EFI as a self-tuning, easy-to-install, EFI conversion for common 4 barrel (4150 flange) style carburetors. They took everything learned from the original Sniper EFI system and added 14 new features to make your EFI conversion more simple, reliable, and modern. It 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! Designed for installation at home in your garage with limited tools and support of Holley's comprehensive installation manual and videos. The user-friendly calibration wizard only requires answering a few simple engine questions to create a base map and begin self-tuning. No laptop or tuning experience required!
Looking for a high performance fuel injection system that delivers power, efficiency, as well as ease of use? Look no further than the Sniper 2 EFI!
Main Features:
- 20 feet of 3/8 in. Vapor Guard Fuel Hose, Fuel Pump, Fuel Pressure Regulator, Filters, necessary hardware as well as a bulkhead fitting to return fuel into the tank
- Only four wiring connections required: Battery+, Battery-, Switched Ignition, as well as RPM
- Next generation ECU features improved RF noise and interference resistance (old car wiring, noisy alternators, faulty plug wires)
- Redesigned throttle shaft as well as plate geometry for smoother throttle feel
- Compatible with complete Sniper EFI Ecosystem that includes plug-n-play Hyperspark Ignition systems (coil, ignition box, distributor), fuel systems (fuel lines, fuel pump hangers), multiple displays and more
- Main harness includes plug-and-play HyperSpark distributor support, for integrated timing control, making ignition setup hassle-free
- Wide Variety of tuning and gauge display interfaces from a 3.5-inch full color LCD Handheld, 5-inch Digital Dash, or Bluetooth dongle, allowing connection of either iOS or Android based cell phone to your Sniper 2
- Integrated transmission kick down provisions for GM TH350/400, 200-4R/700R4 as well as Ford C4/C6 applications
- “Hidden Harness” wiring harnesses exits from throttle body rear for clean appearance
- Inputs and outputs include: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5v), as well as 1x Tach Output
- Redesigned injector connector for improved reliability
- Onboard contactless magnetic TPS sensor ensures accurate TPS reading
- Next Generation mil-spec style M8 positive lock connector for CAN1 and CAN2. This provides the latest in CAN bus technology for simple yet robust connection
- Cast-in fuel crossover from primary to secondary fuel rail
- Throttle body serialized in-house, providing each unit a birth certificate for improved customer service as well as warranty experience
- Included genuine Bosch LSU 4.9 wideband oxygen Sensor provides real-time fuel map learning
- Included clamp-on oxygen sensor kit ensures leak free oxygen sensor installation with stainless steel T-Bolt clamps and stainless steel weldable oxygen sensor flange
Holley 550-511-3XK Sniper 2 EFI Kit Additional Features:
- Fuel Injection Type: Throttle Body
- Flange Style: 4150 Square Bore
- Maximum Horsepower with Gasoline: 650
- Airflow Rate: 800 CFM
- Metering Style: Speed Density
- Throttle Body Material: Cast Aluminum
- Throttle Body Color: Black Powdercoat
- Fuel Injector Size: 100 lb/hr
- Venturi Quantity: 4
- Power Distribution Module Included: No
- Display Included: Yes (3.5 in.)
- Self Tuning: Yes
- User Tunable: Yes
- Fuel Pump Included: Yes
- Fuel Pressure Regulator Included: Yes
- MAP Sensor Included: Yes
- IAT Sensor Included: Yes
- TPS Sensor Included: Yes
- IAC Motor Included: Yes
- Quantity: Sold as a kit
Notes: External inline pump and fuel plumbing kit included. Adaptors for other ignition types also sold separately: 558-329 CD Box to Sniper 2, 558-330 MSD Pro Billet / Crank Trigger to Sniper 2
Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, as well as intake manifolds and much more. From start to finish, Holley has the parts to make your dream a reality!












