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Best Quality Wiring Installations Spokane

In addition to being a certified Holley EFi installer, EPC Racing can build custom wiring harnesses for all your EFi and automotive electrical needs. It goes without saying but we only use the highest quality connectors and bulk-heads to ensure longevity and safety for your vehicle.

When planning out a wiring harness we look 3 basic factors…


Every vehicle is different, which makes wiring installs challenging. Planning the optimal route for wiring takes time. We ensure a superior tuck job with little to no modification to your vehicle. All of our wiring and components are top of the line and engineered to last through the most extreme driving conditions.


Modern day vehicles have more electronic components than ever. With a majority of them relying on one another it is important to ensure any new additions won't interrupt existing components and safety equipment. All of our wiring uses the highest standard connectors and are hand soldered to ensure a strong connection making your new addition look and function like factory.


As with anything we touch, we ensure reliability is the #1 priority. All of our electrical components are only source from the top named brands. Custom automotive wiring is one of our specialities and with over 20 years experience in the industry you can guarantee you will find no better choice.

Read Testimonials

  • 5 of 5

    Fantastic service!!!

    "Ernie is most knowledgeable motorhead in the region. He has a passion for what he does and will not stop until it is perfect. I would recommend EPC racing to everyone from entry-level to the high-level when it comes to performance."

    Aaron R, Facebook
  • 5 of 5

    My car was a total mess when I brought it in

    Fuel was so rich I was leaving a huge cloud of smoke out of my exhaust. Not only did he tune my car he put up with me having stipped bolts and a dead battery. This will be my first stop after getting a much needed turbo upgrade

    Cameron O
  • 5 of 5

    Fixed incorrect tune on my Mustang

    Thank You Ernie for fixing that messed up tune on my gt500 that last tune on my GT500 was from James D'Amore they said he was really good your better by far anyone need a tune call Ernie thats the only person you need to talk too forget the data logging and sending files just call Ernie he will take car of you and treat you right i highly recomended him and thanks again car runs great best call I made and will be using you from now on.

    James H

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