The Sniper Stealth 4150 keeps the look of a carburetor while functioning just like a Sniper EFI system, making it a cost-efficient way to convert to fuel injection with just 4 wiring connections. This master kit adds a complete return-style fuel system consisting of all necessary hardware to return fuel to the tank. Take the build to the next level with improved engine performance, better fuel economy, and easier starting.
Key Features:
- Complete fuel system with all necessary hardware to return fuel to the tank
- Bolt-on 4150-flange carburetor replacement that fits a wide range of factory intake manifolds
- All wiring exits below the rear fuel injector cover for a completely stealth installation
- Air entry is machined to fit most stock-style air cleaners with air cleaner locator provisions
- Only 4 wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
- Genuine Bosch LSU 4.9 wideband oxygen sensor provides real-time fuel map learning
- Clamp-on oxygen sensor kit for 2.25 in. exhaust with stainless T-bolt clamps and stainless weldable O2 flange
- Integrated ignition timing control
- OEM-style TPS/IAC and fuel pressure regulator for dependable service
- High resolution full color 3.5 in. touchscreen for setup, tuning, and gauge displays
- Throttle body mounted ECU — no extra boxes to mount
- Includes transmission kickdown provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6
- Self-tuning ECU means no laptop or tuning experience required
- Available in Shiny, Black, and Classic Gold finishes
Specifications:
- Product Type: Sniper Stealth EFI 4150 Master Kit
- Finish: Shiny
- Flange Style: 4150
- Model: 4150 EFI Conversion Throttle Body
- CFM: 870
- Max Horsepower Rating: 650 Naturally Aspirated
- Injector Size: 100 lb/hr @ 58.5 PSI
- Inlet/Outlet Size: 3/4-16 Female O-Ring (AN 8)
- Fuel Pressure: 58.5 PSI
- Fuel Pump Flow Rating: 240 LPH
- Fuel System: Inline (Return)
- MAP Sensor: 2 Bar
- Height: 3.28 in.
- Transmission Compatibility: 700R4/200R4, Ford C4/C6, TH350
- Sub Category: Service Kits
- Warning: California Proposition 65
- Part Number: 550-870K
Holley part # 534-247 and part # 34-42 are required to complete a bolt-in installation.
FAQ
Does this kit include a fuel system?
Yes, this master kit includes a complete return-style fuel system with all necessary hardware to return fuel to the tank.
How much horsepower can this kit support?
Up to 650 hp naturally aspirated or 600 hp on boost, using four 100 lb/hr injectors.
What other parts are needed for a bolt-in install?
Holley part # 534-247 and part # 34-42 are required to complete a bolt-in installation.
What finishes is this kit available in?
Shiny (550-870K), Black (550-871K), with Classic Gold available on the non-master 550-872.
How is this kit tuned?
The 3.5 in. touchscreen handheld runs a setup wizard that builds a base tune, then the system self-tunes with no laptop required.
