Well i just made a trade with expo5.0 for his american bass xd2000. i was wondering what subs i should put in the back of my 2000 grand prix. i will get a box built for it. i would like 15's i want to be able to get loud and sound good doing it and i would say the price range for both subs would be around in the 400ish area together. thanks for your input. if you have something good for me let me know.