Skip to content

Need Help? Contact Us!

Brake Parts
Exhaust System Parts
Air and Fuel Delivery
- Air Cleaners and Hardware
- Carburetors
  
  Carburetor Parts
  Chokes
- Cold Air Intakes
- Fuel Line
  
  HydraMat
  In Tank Fuel Lines
  Pre-Bent Fuel Lines
  Quick Fix Fuel Lines
- All Air and Fuel Categories
Brands
More
FAQs

Twitter
Facebook
Instagram
YouTube

Brake Parts
Exhaust System Parts
Air and Fuel Delivery
Brands
More
FAQs

Search

Item added to your cart

Collection: EFI Wires and Harnesses

Wanting to go full-custom on your next fuel injection conversion? Here at Modern Day we offer wiring, harnesses, and much more to allow you to make the EFI set-up you've been waiting for!

Sort by:

69 products

Filter:

Filter

Categories

Search

AC and Heat(285)
Air and Fuel Delivery(6347)
Brake Parts(7667)
Charging and Starting Systems(176)
Cooling Systems(1068)
Electrical and Wiring(343)
Emission Systems(164)
Engine Components(4639)
Exhaust System Parts(14804)
Exterior Body Parts(5386)
Fittings and Hoses(1757)
Ignition System(1554)
Interior Body Parts(3961)
Lighting and Lamps(2560)
Performance Upgrades(1140)
Steering and Suspension Parts(5848)
Tools, Equipment, and Chemicals(393)
Transmission and Drivetrain(3716)
Wheels, Tires, and Parts(696)

Electrical and Wiring Sub-Categories

Search

4WD Switches(1)
Back Up Light Switch(10)
Brake Light Switches(10)
Cable Ties(2)
Cruise Control Buttons(1)
Data Acquisition Components(19)
EFI Wires and Harnesses(69)
Electrical Switches(7)
Fuses(26)
Key Fobs(6)
Keys(11)
Neutral Safety Switches(5)
Oil Pressure Sending Units(20)
Relays(16)
Sensors(81)
Wire Connectors(59)

Drivetrain

Search

4x4
All Wheel Drive
Rear Wheel Drive

Cab Type

Search

Reg Cab
Ext Cab
Crew Cab or Quad Cab

Bed Size

Search

Short Bed
Long Bed

Brand

Search

Holley
Holley Sniper
HolleyEFI

Availability (0)

Availability

In stock (64 products)
Out of stock (5 products)

In stock (64 products)
Out of stock (5 products)

Price

The highest price is $1,122.95

$

From

To

Product type (0)

Product type

EFI Wires and Harnesses (69 products)

EFI Wires and Harnesses (69 products)

Sort by:

Filter and sort Filter

Filter and sort

Filter

69 products

Filter

Categories

Search

AC and Heat(285)
Air and Fuel Delivery(6347)
Brake Parts(7667)
Charging and Starting Systems(176)
Cooling Systems(1068)
Electrical and Wiring(343)
Emission Systems(164)
Engine Components(4639)
Exhaust System Parts(14804)
Exterior Body Parts(5386)
Fittings and Hoses(1757)
Ignition System(1554)
Interior Body Parts(3961)
Lighting and Lamps(2560)
Performance Upgrades(1140)
Steering and Suspension Parts(5848)
Tools, Equipment, and Chemicals(393)
Transmission and Drivetrain(3716)
Wheels, Tires, and Parts(696)

Electrical and Wiring Sub-Categories

Search

4WD Switches(1)
Back Up Light Switch(10)
Brake Light Switches(10)
Cable Ties(2)
Cruise Control Buttons(1)
Data Acquisition Components(19)
EFI Wires and Harnesses(69)
Electrical Switches(7)
Fuses(26)
Key Fobs(6)
Keys(11)
Neutral Safety Switches(5)
Oil Pressure Sending Units(20)
Relays(16)
Sensors(81)
Wire Connectors(59)

Drivetrain

Search

4x4
All Wheel Drive
Rear Wheel Drive

Cab Type

Search

Reg Cab
Ext Cab
Crew Cab or Quad Cab

Bed Size

Search

Short Bed
Long Bed

Brand

Search

Holley
Holley Sniper
HolleyEFI

Availability

In stock (64 products)
Out of stock (5 products)

Clear

Price

The highest price is $1,122.95

$

From

$

To

Clear

Product type

EFI Wires and Harnesses (69 products)

Clear

Sort by:

Remove all

69 products

LS1/6 (24x/1x) Engine Main Harness - 558-102

LS1/6 (24x/1x) Engine Main Harness - 558-102

Regular price $522.95 USD

Regular price Sale price $522.95 USD
Unit price per
Ls1/6 Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-133

Ls1/6 Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-133

Regular price $556.95 USD

Regular price Sale price $556.95 USD
Unit price per
Ls2/3/7+ Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-134

Ls2/3/7+ Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-134

Regular price $556.95 USD

Regular price Sale price $556.95 USD
Unit price per
Sniper EFI Input/Output Harness - 558-491

Sniper EFI Input/Output Harness - 558-491

Regular price $53.24 USD

Regular price Sale price $53.24 USD
Unit price per
Holley Sniper EFI 558-490 Sniper EFI Main Harness

Holley Sniper EFI 558-490 Sniper EFI Main Harness

Regular price $136.75 USD

Regular price Sale price $136.75 USD
Unit price per
CAN EXTENSION HARNESS, 8FT - 558-425

CAN EXTENSION HARNESS, 8FT - 558-425

Regular price $60.41 USD

Regular price Sale price $60.41 USD
Unit price per
GEN III HEMI VVT Harness Only - 558-131

GEN III HEMI VVT Harness Only - 558-131

Regular price $115.95 USD

Regular price Sale price $115.95 USD
Unit price per
CAN Adapter Harness, 12' - 558-454

CAN Adapter Harness, 12' - 558-454

Regular price $84.59 USD

Regular price Sale price $84.59 USD
Unit price per
CAN EXTENSION HARNESS, 4FT - 558-424

CAN EXTENSION HARNESS, 4FT - 558-424

Regular price $48.92 USD

Regular price Sale price $48.92 USD
Unit price per
Digital Dash I/O Adapter w/Unterminated Vehicle Harness - 558-433

Digital Dash I/O Adapter w/Unterminated Vehicle Harness - 558-433

Regular price $283.45 USD

Regular price Sale price $283.45 USD
Unit price per
Dominator EFI Auxiliary Harness - 558-402

Dominator EFI Auxiliary Harness - 558-402

Regular price $145.75 USD

Regular price Sale price $145.75 USD
Unit price per
CAN Adapter Harness, 4' - 558-452

Sold out

CAN Adapter Harness, 4' - 558-452

Regular price $48.32 USD

Regular price Sale price $48.32 USD
Unit price per

Sold out
Universal Coil On/Near Plug Harness - 558-307

Universal Coil On/Near Plug Harness - 558-307

Regular price $155.65 USD

Regular price Sale price $155.65 USD
Unit price per
HOLLEY EFI 100FT CABLE, 7 CONDUCTOR - 572-101

Sold out

HOLLEY EFI 100FT CABLE, 7 CONDUCTOR - 572-101

Regular price $228.95 USD

Regular price Sale price $228.95 USD
Unit price per

Sold out
CAN Adapter Harness, 8' - 558-453

CAN Adapter Harness, 8' - 558-453

Regular price $60.41 USD

Regular price Sale price $60.41 USD
Unit price per
GEN III HEMI VVT and SRV Harness - 558-132

GEN III HEMI VVT and SRV Harness - 558-132

Regular price $135.85 USD

Regular price Sale price $135.85 USD
Unit price per

1
2
3
…
5

Quick Links

Repair Service
Contact Us
Fitment Guides
News

Company Info

About Us
Return Policy
Privacy Policy
Terms of Service
Warranty Information

Contact

330-334-3800

If no answer please leave a message we will call back as soon as possible!

Promotions, New Products & Sales. Directly to Your Inbox!

Email

Twitter
Facebook
Instagram
YouTube

Payment methods

© 2024, Modern Day Muffler Powered by Shopify

Choosing a selection results in a full page refresh.
Opens in a new window.