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I would not count on the tuning to be exactly the same...the engine may be the same, but there could be other issues. Best to talk directly to the vendor. The vehicles weigh different amounts, the transmissions likely have different ratios, they'll have different intake and exhaust characteristics when installed in different platforms. Keep in mind, the GT is actually built on a 7-series (normal) wheelbase platform, not the 5-series sedan's, so there has to be changes.
August can be beautiful in Europe, but everything will be crowded. If you decide to go, make reservations early. Check out BMW's agreement with Luftansa on airfare...it an be cheaper, but the 'free' ticket is still subject to a hefty fuel surcharge, and that defeats my opinion of free (it is refundable and changeable, which may make it worthwhile, and depending on where you live, you might get a non-stop).
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