

Every harness we build is laid out on our tried-and-true harness jigs to ensure a perfect fit every single time. We don’t just build a harness and ship it off.

It’s a TWEAK’D harness, redesigned, refined, and perfected for modern, high-end engine swaps. It’s not just a new harness built to factory spec. It means offering special upgrades like braided sleeving, extreme duty heat-shrink looming, and MIL-SPEC firewall connectors. It means using the highest quality connectors, terminals, and wire. It means using higher quality loom protection where we’ve seen problem areas on OEM factory harnesses. It means simplifying overly complicated harnesses and eliminating unused or unneeded circuits for your particular swap. That means routing the harness so that it’s tucked out of the way, making for a cleaner engine bay. 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. We’ve found that in many cases engine harnesses for cars in the US are simply “extended” versions of harnesses from RHD cars. When we design a new wiring harness, we don’t just take a factory setup and replicate it. 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! 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. 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. 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 return every email, and we are determined to do it professionally and promptly. 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. You’re not just another number when it comes to our commitment to customer service. 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. We’ve done the swaps, we’ve experienced the problems, we’ve found solutions, we’ve driven the cars. We’ve been where you are, looking at our own cars with that gleam and that thought, the inspiration of what could be. Here at Tweak’d Performance we didn’t just jump into building wiring harnesses for some engine swap that we’ve never even seen. Or: What makes us better than everyone else!
