I'm looking to put a sub in my g/f's car. i want it to be as loud as possible. im open to suggestions on how to tune the box and model of sub. here are the requirements: must have a final ohm load of 4 ohm 300-500w rms atleast a 12" or 15" MUST BE UNDER $100 SHIPPED (NEW OR USED) any help is greatly appreciated. I've been looking around for some time now, and cannot decide. It's going to be in a 98 Ford Escort ZX2. Thanx!