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Have to agree heard bad things about stacking tunes, why not just go JB3 with the BT cable? I know its a little on the unethical side but hell its your BMW isnt it? I have a JB+ turned to the max and a BT cable, no codes were thrown but you never know could happen at any time. For the money I think JB3 + BT Cable is the way to go. If you go anything less you will be looking for more (already bought a JB3 less than a week or so after installing JB+)
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