While looking at my stock tune on my 3.0T A8, there seems to be some definition issues when comparing it to a different file from an 3.0T A6. Specifically on ECM 29480. Both are SIMOS 8.5 and both are also 2013s.
My A8 flow A8.png
A friends A6 flow A6.png
Here is the stock A8 tune for anyone wanting to take a peek themselves
2013 Audi A8L NEWSTOCK.hpt
I've noticed the X-axis is slightly larger, but I don't believe that would have a 500,000% change on the values