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I'll chime in. 2014 328d with a kerma tdi stage 1 tune. Have had it installed for about 35k miles now. I had to replace the o2 sensors about 5k miles ago. Could or could not be related to the tune but that's the only maintenance I've had to do so far. Happy I have the tune. But at the same time it's not really a need it was a want. The car is still slow regardless of how you look at it. I don't track mpg so that was never a concern for me. Just my two cents
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