You approached it all wrong. Just buy the "tune" online for $450 (put in quotes because all you are actually buying is a registration code in an envelope) and then show up at your dealer and tell them you need this installed and it should take about an hour. The SA will look a bit confused fro a few moments, perhaps need to talk with the manager but will take your car in and do it. Asking the service desk hypothetical questions just gives them the opportunity to put up roadblocks. Just be matter of fact about the whole thing. You can get the whole thing done for less than $600.
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