Holley EFI 550-858K
Holley EFI 550-858K
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Holley Sniper EFI

Holley EFI 550-858K

5 stars out of 1 review
(5.0)|
1 rating
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Key item features

  • Direct Replacement: Bolts directly on as a BBD carburetor replacement, specifically engineered for 1971-1986 Jeep CJs with 258ci 6-cylinder engines.
  • Integrated Design: Features a throttle body mounted ECU, eliminating the need for additional external boxes, and supports up to 350HP with two 100lb/hr injectors.
  • Simplified Installation: Requires only four wiring connections (Battery +, Battery -, Switched Ignition & RPM) and includes an internal fuel pressure regulator preset to 58.5 PSI.
  • Complete Fuel System: Comes with a comprehensive fuel system, including 20ft of 3/8 Vapor Guard Fuel Hose, a fuel pump, filters, necessary hardware, and a bulkhead fitting for fuel return.
  • User-Friendly Tuning: Equipped with a high-resolution full-color touchscreen for setup and gauge displays, and a simple calibration wizard that creates a base map without a laptop.
  • Self-Tuning Capability: The self-tuning ECU and included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provide real-time fuel map learning for optimal performance.
  • Durable Components: Utilizes OEM style TPS/IAC and fuel pressure regulator for dependable service, and includes a clamp-on oxygen sensor kit for 2.25" exhaust.
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Current price is $1,699.95
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Columbus, 43215
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Comparison Chart:
Vehicle model550-858KHolley EFI 550-858K550-511-BPX-SBFHolley 550-511-BPX-SBF Sniper 2 EFI Bundle w/ Hyperspark Ignition System - Fits Ford550869Holley EFI 550-869 Carburetor550-511-BPX-SBCHolley Sniper 2 EFI Bundle Kit SBC BLACK550-511-BXXHolley 550-511-BXX Sniper 2 EFI - Black, Base Kit Without PDM550858Holley EFI 550-858CamaroHolley EFI 550-866 Sniper EFI Self-Tuning KitLSHolley EFI 558-453 CAN Adapter Harness - 8 Foot LengthLS3Holley EFI 822241 Engine Intake Manifold
Vehicle makeJeepHolley EFI 550-858KFordHolley 550-511-BPX-SBF Sniper 2 EFI Bundle w/ Hyperspark Ignition System - Fits FordOldsmobile,Holley EFI 550-869 CarburetorChevyHolley Sniper 2 EFI Bundle Kit SBC BLACK-Holley 550-511-BXX Sniper 2 EFI - Black, Base Kit Without PDMJeep(R)?Holley EFI 550-858-Holley EFI 550-866 Sniper EFI Self-Tuning KitGMHolley EFI 558-453 CAN Adapter Harness - 8 Foot LengthGMHolley EFI 822241 Engine Intake Manifold
Vehicle fitment typeUniversalHolley EFI 550-858KSpecificHolley 550-511-BPX-SBF Sniper 2 EFI Bundle w/ Hyperspark Ignition System - Fits FordSpecificHolley EFI 550-869 CarburetorSpecificHolley Sniper 2 EFI Bundle Kit SBC BLACKSpecificHolley 550-511-BXX Sniper 2 EFI - Black, Base Kit Without PDMSpecificHolley EFI 550-858SpecificHolley EFI 550-866 Sniper EFI Self-Tuning KitSpecificHolley EFI 558-453 CAN Adapter Harness - 8 Foot LengthSpecificHolley EFI 822241 Engine Intake Manifold
Automotive parts divisionPerformanceHolley EFI 550-858KPerformanceHolley 550-511-BPX-SBF Sniper 2 EFI Bundle w/ Hyperspark Ignition System - Fits FordPerformanceHolley EFI 550-869 CarburetorPerformanceHolley Sniper 2 EFI Bundle Kit SBC BLACKPerformanceHolley 550-511-BXX Sniper 2 EFI - Black, Base Kit Without PDMPerformanceHolley EFI 550-858PerformanceHolley EFI 550-866 Sniper EFI Self-Tuning Kit-Holley EFI 558-453 CAN Adapter Harness - 8 Foot LengthPerformanceHolley EFI 822241 Engine Intake Manifold
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Showing 1-1 of 1 review

Oct 22, 2019
MinnesotaEagleWagon
5 out of 5 stars review

Great Replacement for a Terrible Carburetor

I purchased a 1984 AMC Eagle Wagon this summer. The already-sketchy emissions system was incomplete, which caused the computer-controlled Carter BBD to run terrible, and proved impossible to tune reliably. Installing the Sniper EFI kit wasn't difficult, but be prepared for "baby-steps" spiraling out of control. I replaced the intake/exhaust gaskets, the fuel tank, exhaust, and disassembled the dash to install the Sniper EFI. Every step of the way found a new issue with my 35-year old AMC (big surprise? not really). Off-idle response and driveability are night-and-day from the carburetor. I can't speak to fuel efficiency, and the carburetor consistently achieved 20mpg+ (running ridiculously lean at times), but it seems to be on-par. For the Eagle Wagon, the MASTER KIT came up short on fuel line. I would imagine a shorter CJ5 or maybe even an Eagle SX/4 would be OK, but I was about 5-feet short. I also ended up with a different in-tank fuel pump - a Hyperfuel 40019 - but only decided on the Hyperfuel pump after deciding to replace the fuel tank. Overall, I could've saved a few dollars if I had spent more up-front and ordered the basic kit instead of the master kit, but that is all on me, and I am very happy with the end results.

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