the key thing here is its not done. it will become a bandpass set up soon, which means that the hit will increase and will be heard more. as for the seats they will just be for, well you know *cough*, and not for actual use. I have no rear seatbelts and plan to keep it that way. when its finished yall will see the greatness. and the subs are infinity reference 1230's. they hit hard as hell before the bandpass is complete. my friend heard me from a half a mile away today.