if you want to strictly be custom and stand out from the rest do this ..... mold in the 4" into teh steering wheel, re-locate the cd player to the top heater vents or glove box, put the 7" in where the cd players used to be and the other 7" in the trunk next to the subs..... i did the steering wheel idea and the re-locating with the cd player and is soo different from anyone else! be custom, have fun doing it! if you need help doing so, let me know on your post or email me.