Headers
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Do you need a tune after headers? No, alot of guys drive around with LT's untuned for years until they do a cam or other bigger mods. But it will help your car perform at its maximum potential. Although it wont hurt anything
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#10
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I never got a tune for my LT's. I did have to get my brother to delete some codes for me though like rear 02. The car ran great. I would have it tuned with bigger mods for best bang for buck