Put a good set of components in the front doors along with an outboard amplifier and you'll be much more satisfied. You can fit a 5 1/4", 6" or even a 6 1/2" driver in the door with no mofication. For the larger drivers, you'll need to use a spacer to gain mounting depth. But, that's no big deal. You can make the spacer out of MDF, Plastic, etc. You can also purchase spacers that are already made for this application. Keep us posted on your system.