having some problems with my truck that the dealer can not figure out. So they said they are going to put a copilot in my truck, that will record what happens. My ?, will it record efi programing, or anything else that i have thought to be undetectable?

What kind of problems would you be having for the dealer to install a co-pilot? I'm assuming it's a data logging device and not the ATS co-pilot.

If it is a data logging device than it's best to leave the tune stock until the dealer can fix the problem.

yes it is a vdr. vehicle data recorder, you leave it plugged in and when the problem starts just hit the gameshow style red button on top and it will begin recording. i would return the truck to stock tune and then record. most people won't be able to tell but if the tech has a sharp eye, and looks for the right info they will tell.

just out of curiosity what problems are you having? could it be tune related?