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      12-01-2017, 01:45 PM   #5
omgboost
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Drives: 2012 X5 35i
Join Date: Nov 2011
Location: East Coast

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The tune gets rid of the check engine light and increase boost to compensate for the catless downpipe. If you're still running stage 1 with the catless downpipe, you will be fine. Just won't unlock the full potential of it though. Although, more boost = increased wear and tear on the turbo/engine.
Appreciate 0