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I had my 118d remapped, was the joy to drive, mad a big difference and was never found by BMW when in the garage. Sold it with no problems and was still within warranty. It also was in the garage 3 times to get the DOF changed and no one said a thing about a chip.
Had a tuning box on my 123d and it made a difference but I get the feeling it harmed the engine??
But it's up to you. At least you can take the box out.
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