Description

EFI Wiring Harness – Terminated Main Harness – Ford Modular 1999-2004 – Kit

Why Choose Us?



Frequently Asked Questions​

As an Authorized Automotive Retailer in the United States, we take pride in guaranteeing 100% authentic products from all brands available on our website. With partnerships spanning 1,000+ brands and a network of 20+ distributor warehouses nationwide, we maintain millions of auto parts in inventory across the USA, ensuring quick shipping and reliable service to our customers. When you shop with us, you're investing in quality and trust.
We believe we have the fastest backorder system in the U.S. auto parts industry, thanks to our strong partnerships with brands and vendors.Nearly all backordered auto parts are shipped directly by the vendors without any additional delays, or they are placed as special orders on the same day. In most cases, backordered parts are delivered within 5-10 days.
We offer unbeatable prices and the best shipping rates on auto parts, with exclusive protection and insurance included to safeguard your order from damage or loss. Enjoy convenient door-to-door delivery, real-time tracking, and our 100% satisfaction guarantee for a smooth, worry-free experience.
Our standard shipping typically takes 1-3 business days. We will provide estimated shipping time for each product. While we aim to deliver as quickly as possible, this timeframe ensures all orders are processed, prepared, and dispatched with care. If the products are not ready for shipping in 72 hours, we will refund you 100%
Absolutely. Once your order is dispatched, you’ll receive an email with tracking details, so you can follow your shipment every step of the way. Every step of shipping process will be sent through email notifications or using tracking page.
Every product page includes a stock level indicator to show what’s available. We always update the inventory 24/24. We’ll be happy to check availability and provide updates on new stock arrivals if you need a help.
We’re sorry to hear that your order wasn’t delivered in perfect condition. Please email us with your order number, a description of the issue, and photographs of the damaged item. Once we receive this information, we’ll arrange for a replacement or refund and handle the return process.
You can return items within 30 days of receipt. Ensure the product is new in its original packaging and securely wrapped for safe transit. Once we receive the item in sellable condition, we’ll issue a full refund for the product value. Contact us for the return address and further instructions.

About HOLLEY

A leader in fuel systems for over 100 years, Holley fuel management systems have powered top circle track and drag racing teams around the world. Now, Holley offers EFI systems for GM's LS engine, among many other applications. Holley's products also include performance fuel pumps, intake manifolds, and engine accessories products for street performance, race, and marine applications.

International Shipping

Below are estimated rates and delivery times for popular destinations; full carrier options are available at checkout.

Our dedicated team has years of experience managing international logistics and customs documentation to ensure smooth delivery from our US warehouse to your door. Please review our shipping policy and local import regulations before ordering.

Loading international estimates...

Reviews

There are no reviews yet.

Be the first to review “HOLLEY Main Harness 99-04 Ford Modular Engine 558-108”

Your email address will not be published. Required fields are marked *

Recently viewed products

  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    K AND N ENGINEERING Air Intake System 30-3110

    SKU: KNE30-3110
    Product information
    Details...
    Original price was: $350.00.Current price is: $317.99.Add to cart
    Original price was: $350.00.Current price is: $317.99.
    Quantity Only 4 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    PROFORGED Steering Pitman Arm 103-10044

    SKU: PFG103-10044
    Product information
    • Weight1.7 lbs
    • Dimensions7.6 × 3.8 × 3.2 in
    • Quantity

      Each

    • Overall Length

      6-3/4 in

    • Center To Center Length

      5 in

    • Material

      Steel

    • Color

      Black

    Details...
    Original price was: $93.09.Current price is: $80.95.Add to cart
    Original price was: $93.09.Current price is: $80.95.
    Quantity Only 1 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    RANCHO RS5000X Series Shock RS55118

    SKU: RAN55118
    Product information
    • Weight5.83 lbs
    • Dimensions24.25 × 3.25 × 3.25 in
    • Quantity

      Each

    • Product Line

      RS5000X Series Shock Absorber

    • Hardware Included

      Yes

    • Valving Style

      Progressive

    • Internal Design

      Twintube

    Details...
    Original price was: $76.26.Current price is: $66.31.Add to cart
    Original price was: $76.26.Current price is: $66.31.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    MOROSO Blue 4-Hole Wire Loom 97832

    SKU: MOR97832
    Product information
    • Weight0.07 lbs
    • Dimensions7.2 × 5.4 × 0.75 in
    • Quantity

      Pair

    • Variant

      Yes

    • Spark Plug Wire Size Minimum

      7 mm

    • Spark Plug Wire Size Maximum

      9 mm

    • Mounting Location

      Bracket

    Details...
    Original price was: $12.64.Current price is: $10.99.Add to cart
    Original price was: $12.64.Current price is: $10.99.
    Quantity Only 5 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    SCS GEARS Quick Change Gear Set 4-PRO

    SKU: SCS04
    Product information
    • Weight4.95 lbs
    • Dimensions5.7 × 5.3 × 3.3 in
    • Material

      Steel

    • Color

      Black

    • Finish

      Oxide

    • Quantity

      Pair

    • Variant

      Yes

    Details...
    Original price was: $234.40.Current price is: $213.09.Add to cart
    Original price was: $234.40.Current price is: $213.09.
    Quantity Only 2 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    SCS GEARS Quick Change Gear Set 9-PRO

    SKU: SCS09
    Product information
    • Weight5.33 lbs
    • Dimensions5.75 × 5.35 × 3.4 in
    • Material

      Steel

    • Color

      Black

    • Finish

      Oxide

    • Quantity

      Pair

    • Variant

      Yes

    Details...
    Original price was: $234.40.Current price is: $213.09.Add to cart
    Original price was: $234.40.Current price is: $213.09.
    Quantity Only 7 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    JP PERFORMANCE BBM Billet Double Roller Timing Set JP5989

    SKU: JPP5989
    Product information
    • Weight3.9 lbs
    • Dimensions10.3 × 6.9 × 1.5 in
    • Chain Included

      Yes

    • Chain A Style

      Roller

    • Chain A Rows

      Double

    • Chain Link Quantity

      66.0

    • Crankshaft Gear Included

      Yes

    Details...
    Original price was: $126.00.Current price is: $114.06.Add to cart
    Original price was: $126.00.Current price is: $114.06.
    Quantity Only 1 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    JET PERFORMANCE Xcelerator 11- Ford Vehicles 40103

    SKU: JET40103
    Product information
    • Weight0.705 lbs
    • Dimensions7.75 × 7.75 × 2.85 in
    • Quantity

      Each

    • Product Line

      Xcelerator

    • Intended Fuel

      Gas

    • Throttle Booster

      Yes

    • Wiring Harness Included

      Yes

    Details...
    Original price was: $330.00.Current price is: $299.99.Add to cart
    Original price was: $330.00.Current price is: $299.99.
    Quantity Only 2 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    Ti22 PERFORMANCE 600 Top Wing Tree Adjuster Insert Black TIP3773

    SKU: TIP3773
    Product information
    • Weight0.155 lbs
    • Dimensions7.85 × 4 × 0.7 in
    • Length

      7.5 in

    • Material

      Chromoly

    • Color

      Black

    • Finish

      Powder Coat

    • Quantity

      Each

    Details...
    Original price was: $17.99.Current price is: $14.99.Add to cart
    Original price was: $17.99.Current price is: $14.99.
    Quantity Only 1 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    TRANS-DAPT BBC LWP Alternator Bottom Bracket Black 8538

    SKU: TRA8538
    Product information
    • Weight0.885 lbs
    • Dimensions7.85 × 7.85 × 1.7 in
    • Material

      Steel

    • Color

      Black

    • Finish

      Powder Coat

    • Quantity

      Each

    • Product Line

      O.E. Style

    Details...
    Original price was: $52.79.Current price is: $47.99.Add to cart
    Original price was: $52.79.Current price is: $47.99.
    Quantity Only 2 left in stock!
    -+
    Add to cart
    Add to wishlist

    16