when you get the new headunit you will have to either hide the old headunit somewhere in the dash, or isolate the doorlocks & keyless/alarm module and run the proper wiring harness. if you don't tell them, and they don't know what they are doing you'll have problems. i know plenty of people who have taken their civics to circuit city in the states and they weren't aware of this despite the fact it is common knowledge to the honda/acura world