I am lucky... I have no flex and very little rattle... behind each of my doors, stock has 1" vibration material cheap stuff but none the less kinda shocked me when I took the door panels off last weekend and seen that lol... but it will be coming off soon to deaden and redo the mounts for the mids/tweets in the doors and put some of the .5" memory foam behind there or I might grab some of that ccf off that site with some neoprene and do the floors also and the rear deck at the same time.