Holley Sniper EFI Stealth 4150 Fuel Injection Systems 550-870K Systems, EFI, 4150, 650HP Max, Throttle Body, Shiny, Flange, Injectors, Pump, Regulator, Harness, Tuner, Kit
Holley Sniper EFI Stealth 4150 Fuel Injection Systems 550-870K Systems, EFI, 4150, 650HP Max, Throttle Body, Shiny, Flange, Injectors, Pump, Regulator, Harness, Tuner, Kit
A$4,082.42
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Description
Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:43:25
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 | sne550-870K |
| SFX Item ID | 5013649 |
| Accounting SKU | sne-550-870K |
| Manufacturer SKU | 550-870K |
| Manufacturer UPC | N/A |
| Alternative References | 550-870K, SNE-550-870K, SNI550-870K |
Fuel Injection Systems, Sniper EFI, Stealth 4150, 650HP Max, Throttle Body, Shiny, 4150 Flange, Injectors, Fuel Pump, Regulator, Harness, Tuner, Kit
Holley Sniper EFI Stealth 4150 fuel injection systems feature four 100 lb.-hr. fuel injectors capable of supporting up to 650 hp naturally aspirated. The Sniper Stealth 4150 ECU is capable of fuel map self-learning and ignition timing control--improving idle stability, drivability, and wide-open throttle horsepower! These systems also include transmission kickdown provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications. The 4150 is available individually or in a complete Master Kit (see contents listed below).
ALL Sniper EFI Stealth 4150 systems feature:
• Bolt-on 4150 flange carburetor replacement
• Throttle body mounted ECU; no extra boxes to mount
• Supports up to 650 hp with four 100 lb.-hr. injectors
• All of the wiring exits below the rear fuel injector cover—for a completely stealth installation
• Timed spark part for vacuum advanced distributors located under the front fuel bowl—for easy access to the distributor
• Air entry is machined to fit most stock-style air cleaners with air cleaner locator provisions
• Only four wiring connections required (battery +, battery -, switched ignition, and RPM)
• External fuel pressure regulator required, set to a base pressure of 58.5 psi, such as 12-886
• Integrated ignition timing control
• High-resolution full-color touch screen 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
• OEM-style TPS/IAC and fuel pressure regulator, for years of dependable service
• Included clamp-on oxygen sensor kit for 2.25 in. exhaust ensures a leak-free oxygen sensor installation, with stainless steel T-bolt clamps and a stainless steel (weldable) oxygen sensor flange
• Available in three finishes: shiny, ceramic black, and classic gold
MASTER KITS also include complete fuel system with an external fuel pressure regulator preset to 58.5 psi, 20 ft. of 3/8 in. Vapor Guard fuel hose, fuel pump, filters, necessary hardware, and bulkhead fitting to return fuel into the tank.
| Product Attributes | |
|---|---|
| Brand | Holley Sniper |
| Manufacturer's Part Number | 550-870K |
| Part Type | Fuel Injection Systems |
| Product Line | Holley Sniper EFI Stealth 4150 Fuel Injection Systems |
| UPC | 90127078396 |
| Fuel Injection Style | Throttle body |
| Fuel Injection System Type | Single 4-Barrel Throttle Body (4150 Flange) |
| Maximum Horsepower with Gas | 650 |
| Timing Control Compatible | Yes |
| ECM Included | Yes |
| Self Tuning | Yes |
| User Tunable | Yes |
| Fuel System Included | Inline pump kit |
| Fuel Pump Flow Rating (lph) | 255 |
| 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 | 4-barrel square bore |
| Venturi Quantity | 4 |
| Airflow Rate (cfm) | 870 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 | Yes |
| MAP Sensor Included | Yes |
| IAT Sensor Included | Yes |
| TPS Sensor Included | Yes |
| IAC Motor Included | Yes |
| Quantity | Sold as a kit. |
| Special Attention | Master kit includes a filter for before the pump, a filter for after the pump, fittings, clamps and fuel injection hose. |
Compatibility
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