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there's no need to get a tune for just replacing the front pipe and cat back, however, I would recommend buying an OFT (you can find a used one for around $400) and doing a "stage 1" tune for better drive-ability. you probably won't have much of a horsepower increase from the tune, but the car will run better. once you decide you want an aftermarket header (which you probably will later on) then you can get the "stage 2" tune from OFT without spending extra cash and that tune will actually add some extra HP. in regards to warranty work, you can always flash the car back to stock with the OFT as well.
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