Im not saying they wont know, if they dig into it yes. Im just telling you what my dealer says to do as they are mod friendly. But they dont have to dig to see an Exhaust, which could be an instant denial for warranty too.And I said the same thing. But putting the stock tune back into the DME is not a guarantee you're good. As has been indicated BMW can tell you've had a tune put into the DME at some point. This has been born out by various threads over on Bimmerpost with the auto side of things. Do you think they wouldn't have that capability on the Motorrad side?
Personally, I wouldnt own this bike if there wasnt a tune for that horrific flat spot. 50 HP is HUGE, not to mention that terrible cold start crap!