hey there seems to be an audio trend going around where people install drivers underneathe their car or somewhere around the exterior or body of the car. I was wandering if anyone new how to install these drivers? where would be the ideal place to run wires? and what is needed to hook them up?

it's common to mount midbass drivers like this, it's called external venting. The problem is, you need a good amount of airspace for a good midbass and it's hard to make a box in the kicks or doors.