ok ive decided im gonna mount speakers in my FC3S' doors in the top corner where the vents are...now should i try to put in a set of 4" thatll prolly just fit or stay on the safe side and go with the 3.5". im gonna get 6.5" inch midbasses in the bottom of the door so bass doesnt matter TOO much but i still want good imaging. btw this is my first time doin custom speaker mods if that changes things.