The Sniper Stealth 4150 Master Kit is a bolt-on 4150-flange EFI throttle body system built to replace a carburetor while keeping the ECU mounted right on the throttle body — no extra boxes to find room for. Four 100 lb/hr injectors support up to 650 hp naturally aspirated or 600 hp under forced induction, and the system handles complete ignition timing control along with fuel self-learning for improved idle stability, drivability, and wide-open-throttle power. Part number 34-42 is required for a bolt-in installation.
Key Features:
- Bolt-on 4150-flange carburetor replacement
- Throttle-body-mounted ECU — no separate control box to mount
- Supports up to 650 hp with four 100 lb/hr injectors
- Integrated ignition timing control
- Fuel self-learning for improved idle stability and drivability
- Includes high-pressure fuel crossover line
- All wiring exits below the rear fuel injector cover for a clean install
- Includes transmission kick-down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 transmissions
- Classic Gold finish
Specifications:
- Flange: 4150
- Airflow rating: 870 CFM
- Base fuel pressure: 58.5 PSI
- Finish: Classic Gold
- Transmission compatibility: GM 700R4/200R4/TH350/TH400, Ford C4/C6
- Naturally aspirated support: up to 650 hp; forced induction: up to 600 hp
- Part Number: 550-872K
This is the master kit configuration; part number 34-42 is required separately for a complete bolt-in installation. Not a complete fuel system — pair with a compatible Holley EFI fuel system kit for fuel delivery.
FAQ
How much horsepower can the Sniper Stealth 4150 Master Kit support?
Up to 650 hp naturally aspirated or 600 hp with forced induction, using four 100 lb/hr injectors.
Where is the ECU located?
The ECU is mounted directly on the throttle body, so there's no separate control box to find room for.
Does this kit work with an automatic transmission?
Yes, it includes transmission kick-down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 transmissions.
Is anything else required for a complete installation?
Yes, part number 34-42 is required for a bolt-in installation.
Does this master kit include the fuel system?
No, this master kit is the throttle body/ECU unit — a separate compatible Holley EFI fuel system kit is required for fuel delivery.
