Hi, Just bought an M coupe S54. It is extremely clean, low-mileage, and unmodified. These cars are anticipated to have collector value in the future, and I don't want to subvert that. I drive swiftly, and my daily driver has a custom-installed Laser/Radar detector under the hood. Is a non-drivetrain addition like this detrimental to the collector value? I have no idea about such things. Just looking for some opinions. Thanks, all.