Universal MPFI Coil on Plug Main Harness
Type: EFI Main Engine Harness
This harness provides a plug and play upgrade solution for those seeking to convert to Coil-On-Plug. Additionally we have pre-installed a Power Tap for easy access to 12v, 5v Reference, and Sensor Grounds.
Features:
- Built in C-O-P Harness
- Additional 40 amp relay to power individual coils
- 20awq gauge wire or larger!
- Plug and play with 558-312 or 558-318 Smart Coil Sub Harnesses.
- Dual CANbus Connectors for multiple CAN devices
Specs:
- Brand: Holley EFI
- Category: Ignition
- Emission Code: 3
- Harness Application: Universal
- Harness Type: Main
- Part Type: Ignition Harness
- Product Type: EFI Main Engine Harness
- Sub Category: Ignition Wire and Related Components
Tech Resources:
Instructions - 558-117_univeral_mpfi_w_cop_main_harness_diagram.pdf
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
