Holley Sniper EFI Stealth 4500 Fuel Injection Systems 550-841 Systems, EFI, 4500, Throttle Body, Polished, Flange, 1440 cfm, Injectors, Harness, Tuner, Kit
Holley Sniper EFI Stealth 4500 Fuel Injection Systems 550-841 Systems, EFI, 4500, Throttle Body, Polished, Flange, 1440 cfm, Injectors, Harness, Tuner, Kit
A$4,807.94
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Description
Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:43:28
Features
Vehicle Compatibility and Return Conditions.
This item was designed and engineered in the USA for US domestic vehicles. OBD tools, ECUs, dongles, programmers, and tuners may have limited compatibility with vehicles outside the USA due to regional differences in emission standards and system configurations. Some features and functionality may vary depending on the vehicle and location.
Some electronic tuning devices and programmers require activation, registration, or pairing with a specific vehicle’s VIN (Vehicle Identification Number). Once activated or paired, these devices may become permanently associated with that vehicle, restricting or preventing their use on another vehicle, resticting our ability to offer returns or exchanges.
Please review the product details and images to ensure it meets your needs. For clarification or assistance, feel free to contact a StreetFX agent. Note: Returns are not accepted for special order or tuning products unless the unit is deemed faulty.
Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.
Specifications
Reference Information
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Holley Sniper, Sniper, Sniper (holley), Sniper Efi |
| StreetFX SKU | sne550-841 |
| SFX Item ID | 5013708 |
| Accounting SKU | sne-550-841 |
| Manufacturer SKU | 550-841 |
| Manufacturer UPC | 090127045268 |
| Alternative References | 550-841, SNE-550-841, SNI550-841 |
Fuel Injection Systems, Sniper EFI, Stealth 4500, Throttle Body, Polished, 4500 Flange, 1440 cfm, Fuel Injectors, Harness, Tuner, Kit
Holley Sniper EFI Stealth 4500 fuel injection systems are what you need to convert your dragster or Pro-street vehicle to fuel injection. For engines producing 800+ hp, the Sniper Stealth 4500 systems feature eight 100 lbs./hr. injectors and a throttle body that flows a massive 1,440 cfm. These Holley systems come with a USB to CAN tuning cable and free downloadable Sniper EFI software to give you unlimited control of your engine. Holley Sniper Stealth 4500 systems will also look great under the hood in your choice of shiny, ceramic black, and classic gold finishes.
Features and benefits include:
• Supports up to 1,500 hp naturally aspirated or 1,250 hp forced induction with eight 100 lbs./hr. injectors
• Compatible with draw-through or blow-through forced induction applications
• 2.125 in. throttle plates, flow 1,440 cfm for large cubic inch engines
• 2.5Bar MAP sensor
• Integrated ignition timing control
• Programmable launch control via 2-step and timing retard. Both can be triggered by a trans-brake input
• Gen 3 Ultra Dominator-style 4-bolt air cleaner flange
• -8AN fuel inlets
• 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 real time Fuel Map Learn
• Built-in single-stage wet or dry progressive nitrous control
• Three programmable 0-5 V sensor inputs for oil/fuel/dome or nitrous pressure or other critical information
• Six programmable ground outputs, five programmable ground inputs. These can be used to trigger or control external devices, such as nitrous solenoids and boost control solenoids. Or to provide the ECU with an input to turn on function, such as an ignition timing
• One +5 V reference output, +5 V power supply for 0 to 5 V sensors, one sensor ground supply for 0 to 5 V sensors
• Throttle body mounted ECU--no extra boxes to mount
• Only 4 wiring connections required--battery +, battery -, switched ignition, and rpm
• Required external fuel pressure regulator, 12-848 is recommended
• Customizable secondary fuel pump output (TPS, rpm, or boost enabled)
• User-friendly boost control with handheld adjustability
• Free software included--comprehensive data logging tool to help you maximize the performance of your engine
• Real-time data logging to the included 3.5 in. touch screen allows you to save information to the SD card without needing a communication cable
• Programmable 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
• OEM-style TPS/IAC, for years of dependable service
• 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
| Product Attributes | |
|---|---|
| Brand | Holley Sniper |
| Manufacturer's Part Number | 550-841 |
| Part Type | Fuel Injection Systems |
| Product Line | Holley Sniper EFI Stealth 4500 Fuel Injection Systems |
| UPC | 090127045268 |
| Fuel Injection Style | Throttle body |
| Fuel Injection System Type | Single 4-Barrel Throttle Body (4500 Flange) |
| Maximum Horsepower with Gas | 1,500 |
| Timing Control Compatible | Yes |
| ECM Included | Yes |
| Self Tuning | Yes |
| User Tunable | Yes |
| Fuel System Included | None |
| Ignition System Included | None |
| Power Distribution Included | None |
| User Interface Included | 3.5 in. display |
| EGR | No |
| Transmission Controller Included | No |
| Metering Style | Speed density |
| Multi-Port Fuel Rails Included | No |
| Throttle Body Included | Yes |
| Throttle Body Mounting Flange | 4500 Dominator |
| Venturi Quantity | 4 |
| Venturi Diameter (mm) | 54.00mm |
| Airflow Rate (cfm) | 1,440 cfm |
| Throttle Body Material | Cast aluminum |
| Throttle Body Color | Polished |
| Injectors Included | Yes |
| Injector Size (lbs/hr) | 100 lbs./hr. |
| Calibration Module Included | Yes |
| Wiring Harness Included | Yes |
| Oxygen Sensor Included | Yes |
| Fuel Pressure Regulator Included | No |
| MAP Sensor Included | Yes |
| IAT Sensor Included | No |
| TPS Sensor Included | Yes |
| IAC Motor Included | Yes |
| Quantity | Sold as a kit. |
| Notes | Not for use with engines producing less than 800 hp. For use with gasoline only. Use of leaded race fuels may shorten the service life of the WBO2 sensor. |
Compatibility
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