I'm not sure if its the windows for sure or the locks or what. But have 2 sets of door panels, one with power everything, the other base model, and There is a huge difference, perhaps one day i will finally get some time and be able to take the base model doors off and weigh them.

97 Talon ESi 14.943@91.35MPH N/A!
"If you need someone to provide an itemized build of materials and a flowchart to walk you through every build-related question you will need to answer at each step of the process, you shouldn't be playing with cars. "-Driggs