My recomendation though is to go to Lowes or Home Depot or some similar store and get some roofing insulation

Good suggestion. Yeah, my friend said that if he ever needed to insulate a car that much again, he'd use a similar material from Home Depot because the Dynamat is too expensive.

I have dynamat extreme on both front doors and in my trunk. I mainly did it to stop some of the rattling that was happening at higher volumes. It completely got rid of any rattling I had. And suprisingly, even just doing the front doors cut down on some road noise.

This is good to hear. Because I've been getting some rattles that I think are coming from my doors, and I'd like to work on getting rid of those. I'll have to keep my eyes open for that roofing insulation material. How does it stick? Is it sticky-backed like Dynamat?