I have a 2003 Honda CRV with one JLW3v2 12inch sub in a sealed box. Its powered by a 300 watt Rockford punch amp. I only have a stock deck system .. i havent upgraded my deck. The sub sounds decent inside the car but it cant be heard very well outside. What is the best way i can upgrade it to make it sounder better outside the car? Some options i can think of is getting a deck, ported box, another sub with more power. (keep in mind i dont want to spend too much money on this upgrade)