Couldnt install 6x9s behind factory grills, not enough depth. Installed pioneers in front without hacking trims, just needed to remove some door metal, MDF facia and backing plates. Rears went behind factory grills, same pioneer model, 6", got rid of factory plastic mounts for MDF. Also used sound deadening material throughout front and rear doors, sounds superb, a lot of work to get the postioning just right for the fronts, not much room for error, but well worth effort.