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Welcome to Tweak'd Performance!


Tweak'd Performance is located in Summerville, SC. We build brand new, fully customizable engine wiring harnesses for popular engine swaps. We intend to supply you with a top-quality product in a timely manner while providing outstanding customer service.




June 2015:

We've been so busy building wiring harnesses for you that we haven't made a website update! Here at Tweak'd Performance we've improved and streamlined our production process to offer unmatched customizability for your wiring harness needs. 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. Think about where you're sending your money, check the reviews and feedback on the forums, and then give us a call!

Tweak'd Performance – Fully customizable wiring harnesses for GM LS1, LS2, Toyota 1JZ, 2JZ, 1UZ engines, every variation of VVTi and non-VVTi, dual ECU, CAN BUS solutions, and new products are on the way!

Have a harness idea that you want Tweak'd to build? Give us a call, wholesale pricing is available.



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