when u hear a car go BOOM, what are they runnin?

i'm not entirely new to car audio... but I don't know ANYBODY with one of those cars that seriously booms. i'm talking like you hear the bass coming minutes before the car, echoing through the neighborhood boom.

what are these deaf psychos running? 1/2 dozen 15s and 6000 watts? a couple of good 12s and 1000 watts?

also, what do these people have into their cars?

i guess the loudest car i know of is a daytona with 2 10" JLs and a bahn around 800w rms. pretty loud but not even close to some of the ones i've heard.

i'm running a offbrand amp @ 300rms, with a single 12" mtx (both 5 years old) and i'm quite happy actually.. some may laugh but for me i just want the extra umph and punch that you can only get from subs.