i would just say depending on how much bass you want.. the more rms the sub can handle the more bass you will get.. depending on the size of the box and they style box you use.. if your looking for hard hitting bass i would go with a ported box.. also make sure to use dynamat if your going into large wattages and have the right size wire.. will make a world of difference.. also make sure you have enough power in your car to beable to power the amp you buy that can push your subs.. so if your stock batt cant hold it make sure to buy a audio battery.
