Originally Posted by Rekrul
Dont remove your top speed limiter
Dont increase your rev limit
Don't remove cold start(debatable)
These are three easiest ways for BMW to see if you have had a tune. So if you flash back to stock, there should be no red flags whatsoever.
Can BMW see the tune if you don't drive the car passed the rev limit or top speed? It would probably be easy to exceed the rev limiter via tune, however, the top speed (whatever that is) is not something that would happen everyday.