It will make a night and day type of difference. I have Dynamat extreme all throughout my ride and it works great. Dynamat is expensive though, I would of used a less expensive brand but I had already done half my car before I found out about the other products like second skin and fatmat. And like the person above me stated I like to use just one brand, so I spent the money and finished the rest in dynamat also. Im OCD like that lol. But that was a couple years ago and it is still working great, never had a problem with it. Im hearing good things about audio technix though and their prices are supposed to be very competitive.