Engine Harnesses

These are custom made to order. Expect to send in your original harness, and minimum of 10 week wait time.

Finally, a full harness for your V8 swap to make things much easier! We've done more than a few over the past decade, and now we're teaming up with the renown Dr. Tweak to offer a top shelf harness and their lifetime warranty! 

These harnesses are all custom made for each individual application, so in many cases, we will need a core harness to start with. Expect to need to send in your UZ harness, as well as your intended chassis' factory engine harness, depending on which it is. Connectors typically do not get reused from the original harness'; we just need them to verify connector type and length as the UZ engines have a variety of harness differences depending on year and chassis.

Please contact us and let us know directly what your application will need regardless, and we'll be happy to get another UZ powered vehicle out there tearing it up!! As of right now, we only have support for automatic transmissions if you run the factory ECU for them. 

Standalone applications will require a dual ECU setup in most newer 1998+ chassis'. On Toyotas specifically, the factory chassis ECU gets retained for MultiPlex compatibility, meaning the factory ECU will control the A/C, gauge cluster, throttle, auto transmission, ABS, etc. Feel free to reach out to us with what your swap is and we can make sure you get the right price and harness for your application!

These are custom made to order. Expect to send in your original harness, and minimum of 10 week wait time

Please expect a 3-4 week wait time as these are custom made to order harnesses

We're big fans of Link ECU at XAT Racing! With all the features (and often more) that AEM ECUs provide, but at a better price, Link has quickly become a favorite of many tuners worldwide. Plus, Link ECUs are regularly available in stock, and AEM has discontinued their lineup!

This listing includes the custom made to order harness to make your Link G4+ or G4X series EMS "plug'n'play" to your car. Please select your application above, as well as any extras you might need to complete your build. Thunder ECU and sensors not included with base price.

Please contact us with any questions or inquiries!

As a great supplement to our turbo kits, we commissioned these hand made in the USA patch adapter wiring harnesses to plug in to the ECU Masters DET3 (Digital Engine Tuner 3) piggyback system, as well as the factory JDM 95-97 JZS155 hardtop Crown ECU and harness.

We're huge fans of the Crown at XAT, having brought over around a dozen by now. This terrific platform yearns for a turbo setup! Since a standalone ECU is not ideal for everyone or every build, we now offer this alternative that keeps all factory functions and drivability of your 2JZ VVTi Crown, but lets you fine tune further and swap out injectors for when youre ready for more power!

We strongly recommend going this route in conjunction with our turbo kit. You will be limited to wastegate pressure and low boost on the kit, unless you upgrade injectors/fuel system and go with a tunable ECU.