Using this Dialed Cobb AP Mount is a breeze. First, take out the holder from the AP mount that came with your AP. You won't need to cut, drill, or make any changes to install it. Just place it as a replacement for the defrost vent on your 2015+ Impreza model. It's designed to let you keep using your defrost vent. When it comes to maintenance, since it's 3D printed, just keep it clean with a soft cloth. Avoid using harsh chemicals that might damage the 3D - printed structure. Also, make sure the holder is firmly attached to prevent any wobbling during use.