3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Not at all, according to the Magnusson Moss Warranty act, your dealership cannot void your warranty due to aftermarket modifications. It is their prerogative to show proof that the said aftermarket modification caused a problem.
For instance, they cannot refuse to replace a faulty window regulator because you have an aftermarket stereo system.
I have a buddy that put a chip on his GTI. It has four different settings and then he can also turn it off for when he takes it to the dealership. It is all controlled by one of the buttons on his turn signal stalk. If you are worried about warranties, get something like that.
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