I am not doubting the fact that they told you they have a 550/F10 flash tune. What I am doubting is if it actually works as claimed, when they don't provide anything other than a webpage to show the gains.
I e-mailed Renntech on 6/28/14, and received that reply on 7/3/14.
I'm of the belief that they really don't know BMW's as well as they know MB's, and it isn't clear within the company what they do and don't offer for the F10. You say they have one for the F10, where their page shows an F07, and the email I received says X5.
So even if they offered the tune (and it worked), and they could produce numbers that show the improvements claimed, is it worth $2700? I think for some people it would be.
Here's the quote from their webpage, which answers most of my questions about their ability to tune BMW's:
Quote:
RENNtech has evolved and grown from humble beginnings into the foremost authority on luxury
automobile performance tuning and offers complete tuning solutions for Mercedes Benz, Porsche, VW,
Audi and Bentley vehicles
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