550-604N HP EFI ECU & Harness Kits

Take control with the 550-604N HP EFI ECU & Harness Kits — a universal V8 Multi-Point Fuel Injection system that brings modern EFI performance to stock or built late-model engines. Includes an NTK oxygen sensor for precise air-fuel feedback and a rugged harness kit for a clean, plug-and-play installation.

• Universal V8 Multi-Point Fuel Injection delivers consistent fuel delivery and improved throttle response.
• Included NTK oxygen sensor ensures accurate monitoring and tuning.
• Plug-and-play compatibility with stock or built late-model EFI engines
• Replacement ECU for older Holley C950 systems for a seamless upgrade path
• Harness kit included for straightforward installation

Benefit-focused and performance-driven, this kit offers modern control, easier tuning, and enhanced reliability. It’s ideal for automotive enthusiasts seeking Performance Fuel Injection improvements and versatile Performance Parts compatibility.

Shop now to upgrade your EFI system or learn more about compatibility with your vehicle.