Any of you bass heads using dynamat? I have my trunk dynamatted, but serves no purpose now. I think there are some cheaper alternatives also (generic).

I was going to dynamat my trunk, doors and maybe the floor later, but I need more money. For right now I just have the front door speaker kit (2 10"x10" pieces) to go behind the Infinity components. I was also thinking of just using heavy rubber (can't remeber what it'* called) like we used to install in the Buses over the engine compartment. Heavy, but it served the purpose well.