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(5.0) 195+ Trusted Customer Reviews

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Holley EFI 558-134 Holley EFI LS Main Harness

SKU ds_BBVL_558-134

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Description
These harnesses are designed to fit most 24x and 58x LS engines, from 1997-2012. They are a perfect fit for installers wanting to mount the any Holley EFI ECU inside of the passenger compartment where it is away from the elements, and easy to access.

Specifications

Description_DEF Engine Wiring Harness
Description_DES Holley EFI LS Main Harness
Description_EXT Holley EFI LS Main Harness; For Use w/58X Crank 1997-2012 LS Engines; Plug And Play; Extended Length;
Description_FAB 22 in. Longer Than Previous Harnesses
Description_FAB Designed For Use On 24x/1x And 58x/4x LS Engines
Description_FAB Extended Length Allows You To Mount The ECU In A Wide Variety Of Locations
Description_FAB Plug And Play With Dominator/Hp/Terminator X And Terminator X Max ECUs
Description_FAB Relay Breakout Is Also Moved Back From 19 in. To 43 in. From The ECU Connector
Description_MKT These harnesses are designed to fit most 24x and 58x LS engines, from 1997-2012. They are a perfect fit for installers wanting to mount the any Holley EFI ECU inside of the passenger compartment where it is away from the elements, and easy to access.
Description_SHO EngWiringHarness
height 4.5
length 15.1
WARNING CA Proposition 65 Yes
WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
weight 5.675
width 14.4
Fitment
Here's What OUR CUSTOMERS Have to Say:

Since 2018, We've Shipped Over 35,000 Automotive Parts to our Customers.

4.6/5

+2900 Verified Reviews

Easy to find and order. Customer service was responsive and helpful. It fit my vehicle and is protecting the back of it very well

Specific parts for my vehicle were easy to find Shipping was good and website is clear and easy to use

Very happy with the running boards, and the shipping was prompt.

Super easy, discount code worked well for my order

I will buy from here again.

Easy to use site, comprehensive descriptions. Relevant results

Quick shipping, good prices. Great selection of products.

Super easy, discount code worked well for my order

Easy buying process. Fast shipping. Lots of selection!

Great prices looking forward for possible tonneau cover from your site

Quick response and went the extra mile to answer my questions. Very professional and knowledgeable, having nothing but good things to say about the team at TPS

Fast and Quick,easy to understand The product was excellent and packaged extremely well, I would recommend them to all my friends.

The staff was very helpful and the price point is fair. Rafael was very accomodating and responsive to request to cancel order and reorder a different tuner.

Excellent service and price is good too Thanks.

Good service !

Purchasing process was extremely fast and simple, and the product came on time. 5/5 stars.

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How do I know if a part fits my truck?

Use our vehicle filter by entering your truck’s year, make, and model. If you're unsure, our support team is happy to help.

Where in the US do you ship to?

We ship to all of the continental US except California - we do not ship to the states of Alaska and Hawaii, or to Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands.

How long will it take to receive my order?

Delivery times vary depending on your location and item availability. Most orders arrive within 2–7 business days.

What is your return policy?

We accept returns within 30 days of delivery, as long as the item is unused and in its original packaging.

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