The Sniper EFI BBD Master Kit is a self-tuning EFI conversion built specifically for 258ci-powered Jeep CJs, replacing the factory BBD carburetor with throttle-body fuel injection and adding integrated ignition timing control. It's suited to trail rigs and weekend cruisers alike, putting an end to cold-start issues, hesitation, vapor lock, and flooding while improving throttle response and wide-open-throttle power over the carburetor.
Key Features:
- Throttle-body mounted ECU — no extra boxes to mount
- Supports up to 350 HP with two 100 lb/hr injectors
- Only 4 wiring connections required
- Internal fuel pressure regulator
- Integrated ignition timing control
- Full-color touchscreen for setup, tuning, and gauge displays
- Simple calibration wizard — no laptop required
- Self-tuning ECU means no computer expertise needed
- Includes Bosch LSU 4.9 wideband oxygen sensor
- OEM-style TPS, IAC, and fuel pressure regulator for long service life
- O2 sensor kit sized for 2.25" exhaust for a leak-free install
- Includes 20 ft of 3/8" Vapor Guard fuel hose, fuel pump, filters, and hardware to return fuel to the tank
- Stainless steel T-bolt clamps and a stainless weldable flange included
Specifications:
- Type: Throttle-body mounted, self-tuning EFI conversion, Master Kit
- Application: 258ci Jeep CJ, BBD carburetor replacement
- Max Support: 350 HP with (2) 100 lb/hr injectors
- Wiring: 4-wire vehicle connection
- Display: 3.5" full-color touchscreen
- Includes: Handheld/onboard monitor, 20 ft EFI fuel hose, fuel pump, filters, return bulkhead, wideband O2 sensor kit, hardware
- Finish: Shiny
- Part Number: 550-858K
Part of Holley's broader Sniper EFI ecosystem — pairs with HyperSpark ignition components, air cleaners, and digital dashes for a fuller conversion.
FAQ
What vehicles is this kit designed for?
It's built specifically for 258ci-powered Jeep CJs running a factory BBD carburetor.
Does this kit include ignition timing control?
Yes, unlike the standard Sniper 2300 kits, the BBD Master Kit includes integrated ignition timing control.
What's included in the fuel system?
20 ft of 3/8" Vapor Guard fuel hose, a high-pressure fuel pump, pre- and post-fuel filters, a return bulkhead, stainless T-bolt clamps, and a stainless weldable flange.
How much horsepower can it support?
Up to 350 HP with the included (2) 100 lb/hr injectors.
What oxygen sensor is included?
A Bosch LSU 4.9 wideband oxygen sensor with a leak-free O2 sensor kit sized for 2.25" exhaust.
