umm the fronts are 6" splits man and the rears are like 3" factory, but i managed to squeeze a set of Boston 4" in there...........
I put MB Quarts in the front and they sound pretty crazy! need subs tho!
But i think the Boston Rallies are a bit bassier if you dont want to put in a sub!???
But listening to the 2 next to eachother the MB's sounded better...........