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When your dealer service is due (oil change or w/e), you need to take after market wiring comp chip out and back to stock....except dinan products. Authorized dinan BMW dealers can service your car without removing Dinan's parts. BUT, Vishnu or other after market "plug n play" wirings/chip, dealers will give you hard time about it !! That includes, possibility of terminating your factory warranty.
BMW recently stopped offering in-house warranty w/ Dinan products. Dinan uses the same warranty when you use their products so when you have to do any type of work on your car you need to take it to Dinan not BMW.