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Ok, so here is what I think is going on. The power increas in the 2013 X5 w/PP was a software revision by BMW. Basically a stage 1 tune. Your engine is not the same 450hp version which is in the 550i, 750i and 2014 X5 - those engines have valvetronic and some other internal differences which accounts for the extra 50HP.
So it looks like Dinan did not consider their tune for the small amount of 440HP motors in the 2013 X5 w/PP.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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