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After watching what a stock block b58 can handle I wouldn't be to worried about running a piggy back if you follow what they recommend. You are def right bmw can see it but honestly wouldn't worry to much about it. If you haven't seen the Racechip has a warranty too. Honestly if its going to cost you the factory warranty I would think a full on flash would be a better probably even safer route. I saw a video on youtube last night of a guy running 8.9 on a stock block g42 240i xdrive, multiple passes so the b58 seems pretty stout.
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