Agreed the BTL will be louder than the Q..... Still don't agree that a BTL is the best sub given the OP's goals and details (or lack thereof) From a monetary point of view it is asinine to reccomend this guy a BTL when he only wants to be louder than a 10" alpine X woofer..... So if you are on a budget you might want to look into other options... I realize you haven't set any budget constraints, but it might be better to look at the bigger, overall cost of your whole system and take into account all the different pieces (amp, enclosure, wiriing, battery/h.o. alt if needed, etc).. If you truly don't have any budget limitations, props to you lol Like myself and others have said, it really is all in the install and details.. things like an upgraded alternator (if needed), upgraded batteries (if needed), proper wiring, sufficient amp, proper enclosure size/tuning, sound deadening, proper enclosure placement, etc. all help in how your system sounds at the very end.... What sub you get is a small piece of a large puzzle in getting your system to sound optimal.. OP-I apologize if i spread any misinformation, didn't mean to... I'm continually learning as well... carry on