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If you're talking about keeping the primary cats and stage 1 tune, save your money and get something else. Not worth risking your warranty. I don't think you'll notice a difference.
DCT tune, however, is worth it with faster gear engagement (especially reverse). But will void any transmission repairs in the future if they find it and can easily blame the failure on it. It's up to you to prove the dct tune didn't break your transmission if anything goes wrong.
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