What amp you have it hooked up on now and what amp are you putting on it? Box is 2.5 cubes tuned to 32 if I remember correctly so it shouldn't take much to get the sub moving.
How does it fit in that mustang trunk lol?
whatever he has its gonna be better than what i was powering it with lol
he hasnt had that mustang in years LOL its in a 4 door tacoma