Quote:
Originally Posted by alohasurftoad
any reputable stage1 tune, jb4 if you're thinking of adding a down pipe. flash tune if there's a reputable shop in your area. piggy back or flash tunes provide the most "bang for buck" for power mods.
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Hey I just picked up a '14 F30 335i. I hear a lot about the jb4 tune but does anyone get flack from BMW after tuning? Any CPO warranty issues?