My opinion, i dont believe you
BMW dealerships not only endorse this but don't have problems with dinan upgrades, let me remind you, they do these upgrades at the dealership.
Can anyone out there tell me they have had a problem directly related to a dinan upgrade. Has anyone had engine failure or early fatigue do to this?
Maybe I am wrong and my car is now doomed for problems and failure.
Engineer prob says same thing about upgrading your wheel size, They will never endorse anything other than what they design, my opinion