its pretty easy to make a crx loud, and thats a great sub to use. im pretty sure some crx owners can chime in and let you know whats best for your car. im pretty sure you can put more power on that sub though. i have a buddy with a btl 18 on a fosgate 4000 in a trunk car, and its loud as fawk. maybe more power, and something with sub up, port back duel tuned for daily, and spl...like a 36hz interchangeable port, and a 52hz port? im not sure though.