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Toyota 2JZ, 1JZ, and VVTi Harnesses

Toyota 2JZ, 1JZ, and VVTi Harnesses

Starting at: $1,199.00

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Please Choose:

GM LS2/LS3/LQ9 Coils x6 (including "Mojo" kit)

Denso / ID2000 / JDM High Impedance

LS1 or Square Bosch-style with metal clips - High Imp

LS2 / LS3 / ID1000 / USCAR

USDM Low Impedance Injectors (add resistor pack)

Aftermarket / AEM MAP Sensor

Aftermarket / GM IAT Sensor

AEM Wideband

LSU4.2 / LSU4.9 Wideband

Newer round style plug

Older square style plug

Round Plastic Connector

Round Plastic Connector

Oval Connector

Round Connector

EMS Options-Aftermarket EMS Only

Fuel Pressure (3-pin psi sensor)

Flex Fuel (Continental Sensor)

Flex Fuel (ProEFI Sensor with pigtail and 4-pin plug)

MIL-SPEC Firewall Connector and Plate (Manual Trans Only)

Expedited Service

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Brand New 2JZ / 1JZ Engine Wiring Harnesses

These wiring harnesses are built using new wire, new OEM terminals, and new OEM connector housings. Available for auto or manual transmission (auto is $200 extra), and can be set up for universal use or made completely plug and play to your specific chassis. Your original engine harness might be required to get the body plugs from, but everything else on this harness is BRAND NEW.

Are you running a stock ECU? AEM? ECUMaster? Haltech? ProEFI? Infinity? GM coils? ID2000, ID1000, Bosch, Denso injectors, flex fuel, no problem. We carry in stock every connector for every single EMS, injector, and coil option so when you order a harness from us we can have it put together and sent your way as quickly as the next day for extremely urgent jobs! Equally important as speed and customizability is the fact that all of our harnesses are made here in the USA, while many companies send their production to be done in totalitarian countries with unethical labor practices.

A note about DUAL ECU harnesses - many new vehicles use CAN BUS controlled gauges which normally don't work without the factory ECU. For certain models we can build a dual ECU harness which will keep these original functions working like normal. Your original engine harness is required as a core in these cases (examples: Honda S2000, 350z, G35, E46, FRS/BRZ, etc)

Standard looming - Our standard looming consists of braided sleeving on the individual circuits and split braided sleeving on the bulk of the harness which is secured with low-profile zip-ties. This gives the same look as a fully braided harness but still allows access into the harness for future modifications!

Fully Braided sleeving is available for an additional $200:

MIL-SPEC firewall connector:

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.

Here at Tweak'd Performance we've been doing plug and play wiring conversions, custom engine harnesses and wire tucks for over 9 years. We pride ourselves in supporting our product for LIFE. If you ever have a problem with any of our wiring work, we'll either help you diagnose and fix the problem over the phone or email, or we will cover shipping both ways and repair it for free!

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