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We had a customer with a 135i Coupe that we superchipped for him when the 135 first came out. It came with a reader that you could plug in, upload the superchips map and it bumped it up to about 350BHP. When taking it to a dealer for warranty/service work, he'd just plug the device in again and re upload the factory map. There was no way of telling that it had been done afaik.
ricky2slicky
indeed, but you would be in serious trouble if they did