i hooked up the two kickers in my car to the 1100.2 crunch amp at about 75%, the bass was strong enough to hear it on the doors while outside of the car, and to shake the mirrors
but didn't seem to have the quality, for the time being i traded my bro for his for his p2 and his old school kenwood "bass tube"

he's got bass in his car that hits hard and still fits behind his seat in his 3000gt
i simply put the tub in the "trunk" at the very bottom, not as much bass but better quality