Originally Posted by RupertPupkin
My 6MT 330i muffler delete droned horribly for the first maybe 100 miles at 2k then for some reason went away. even after ecu resets and now about 5k miles since it is perfect.
That is great news. Hope mine does the same.
coasting/maintaining speed at 2K RPM, but gradually feeding in the power really brings out the drone. Fades away after 2K.
Time will tell!