Originally Posted by mcp202
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.
From what I understand and read from the more knowledgable individuals on this forum (tuners themselves). If those specs are exceeded it is an easy way to tell if you have a tune. Now if you have the options and dont exceed them same principle applies. However if you hit 8600 rpm due to the rev limit removed or exceed your top speed... then it will store in the ecu. Now I have also heard this applies to cold start removal and O2 readiness being set to ok even if you are cat less.