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If it was a BMW dealership you could try to get some sort of extended warranty for them if they did not disclosed it and it worries you. If its not a bmw dealership, don't bring it up to BMW if you are still under warranty.
Personally, I don't think a tune alone will have an adverse effect on the car, but that's me. Def will have an effect on the performance you are experiencing right now...
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2011 335is Coupe MT/Space Grey/Saddle Brown/Sunroof Delete/Stripper Car
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