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About Us

Phone: 800-533-6775

Our Address is:

Tweak'd Performance LLC
116 Pidgeon Bay Rd Unit F
Summerville, SC 29483

Have You Been Tweak'd Yet?

Today, Tweak'd Performance is known as the go-to place for wiring harnesses for Toyota engine swaps. Our journey has been a storied one, and we have been blessed to have been able to share it with so many of our fans, customers, and friends over the years.

Tweak'd Performance started out with humble beginnings in 2004 in a small two-bay shop in rural Vermont, dedicating our time from day one to figuring out solutions to difficult engine swaps. Back then we probably would never have believed that our little shop would evolve into the leading producer of Toyota swap wiring harnesses! But we've made it our goal to listen to our customers' feedback and help them get what they need, and the overwhelming call for a good solution to engine swap wiring had to be answered.

The early days. Enough people thought we were in Arizona that we decided it prudent to change our name.

We've learned a lot over the years, not just about the nuts and bolts, the wires and connectors, but about ourselves and about building a great business. Like you, we've had our fair share of dealing with companies who have taken our money and not followed through with their promises, that's why long ago we made the commitment to provide outstanding customer service to you, our most important asset. The consistent repeat customers that we have along with most of our new customers finding us through referrals and word of mouth says that we're on the right track!

One of many exciting developments has been the research and development of brand new engine swap harnesses. With the new relationships we built over the years we were able to finally source all of the original connectors, terminals, and other parts needed, plus develop techniques to build wiring harnesses from scratch with no core harnesses required. It seems that the days of having to pack up your harnesses and ship them to us in a box to be stripped and converted are slowly going away, and while we still offer wiring conversion services, we are confident that the future has more in store for us when it comes to offering brand new, redesigned, and upgraded products.

In today's Charleston, SC facility, the constant buzz of wiring harnesses being assembled, phones being answered, and orders being boxed up is a big step from where we started in 2004. And thanks to you, our loyal customers, we've been able to continue to design, refine, and perfect solutions for your engine swaps. The days ahead will continue to bring many changes, new products, and exciting new opportunities, and you can continue to count on Tweak'd Performance to be there, raising the bar for the best products, support, and service!

The Tweak'd Difference
Or: What makes us better than everyone else!

Superior Knowledge Base

Here at Tweak'd Performance we didn't just jump into building wiring harnesses for some engine swap that we've never even seen. We're gearheads, just like you. We are "the" Toyota engine swap guys. We've been where you are, looking at our own cars with that gleam and that thought, the inspiration of what could be. We've done the swaps, we've experienced the problems, we've found solutions, we've driven the cars. We have designed our engine harnesses and conversions from the ground up to make these swaps go faster, smoother, and have a cleaner, more reliable end result.

Superior Customer Care

You're not just another number when it comes to our commitment to customer service. That's why we have our phones staffed all week long and while we can't always get every incoming call, we return every single voicemail that we receive. We return every email, and we are determined to do it professionally and promptly. Whether you have questions about one of our products, need advice on your engine swap, or you're running into something unexpected with installing your harness and getting your engine started, you can count on Tweak'd Performance to be there. We've got engine swap experts on the line ready to help you troubleshoot any problems, and we support our product 100% of the way, 100% of the time, forever. If you ever have a problem with a Tweak'd Performance harness you can trust that we will help you fix the problem or we will repair it for no charge and cover all shipping charges. Even if you didn't buy the harness from us directly and just got it with your car or your swap, we're here to help!

Superior Design and Production

When we design a new wiring harness, we don't just take a factory setup and replicate it. We've found that in many cases engine harnesses for cars in the US are simply "extended" versions of harnesses from RHD cars. So when it's time to design a harness for your engine swap, we take a fresh look and see all of the improvements that we can make over the factory harness. That means routing the harness so that it's tucked out of the way, making for a cleaner engine bay. It means simplifying overly complicated harnesses and eliminating unused or unneeded circuits for your particular swap. It means using higher quality loom protection where we've seen problem areas on OEM factory harnesses. It means using the highest quality connectors, terminals, and wire. It means offering special upgrades like braided sleeving, extreme duty heatshrink looming, and MIL-SPEC firewall connectors. It's not just a new harness built to factory spec. It's a TWEAK'D harness, redesigned, refined, and perfected for modern, high-end engine swaps.

Superior Quality Control

We don't just build a harness and ship it off. Every harness we build is laid out on our tried-and-true harness jigs to ensure a perfect fit every single time. Every detail is checked to make sure that your wiring harness is built to our standards. We don't ever send a harness to a customer unless we would happily install that on our own engine swap for our personal car. Then not one, but two engine swap experts doublecheck every single terminal, connector, and wire on your harness to make sure every circuit has perfect continuity. While we all know that mistakes aren't impossible, we ship every one of our harnesses with full confidence that you, our customer, will never need to use our unbeatable LIFETIME warranty.

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