If your question about the ECU is for a performance upgrade, I don't think so. FRom my research, the POLICE Expeds didn't have any performance upgrades because they are not pursuit vehicles. They would only have a high amp alternator, and possible beefed up suspension, brakes, extra capacity radiator, oil cooler and the stealth function dome light.
Did you find something different in your research of the vehicle?
Are there any police parts like cage, console, spotlights on it? I would be interested in all of these things if it does.