I just called local dinan dealer they said JB4 is the worst tune you can do on a car, figures a dinan dealer would say that lol. I also spoke with another guy who said he actually tunes the car manually with no external chip module box added and that's the best way to go since he can remove it for $100 if I ever need to get dealer service. any ever heard of this kind if tune? I mainly worried cause I paid extra for 100k mile warranty and would hate to void that
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