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. Take the build to the next level with improved engine performance, better fuel economy, and easier starting. This kit supports up to 650 hp naturally aspirated and 600 hp on boost with four 100 lb/hr injectors.
Key Features:
- 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 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
- Finish: Black
- 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 System: Not Included
- 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: 550-871
Fuel system not included — an external fuel pressure regulator set to 58.5 PSI is required. Holley part # 534-247 is required to complete installation.
FAQ
Does this kit include a fuel system?
No. The 550-871 does not include a fuel system — an external fuel pressure regulator set to 58.5 PSI is required.
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 to complete installation?
Holley part # 534-247 is required to complete installation.
What finishes is this kit available in?
Shiny (550-870), Black (550-871), and Classic Gold (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.
