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It matters what year 4v you use. If you use 96-98 yes, but you will needs to get IMRC deletes, if not you can't use the GT harness. 99-04 4v, you should just be able to retune your harness
i will be using 03' cobra heads with an 01 cobra intake. i dont need an IMRC delete for those right? and would i be able to swap over the COP from my gt to the new heads?