Has made significant improvements in my cruze I immediately noticed improvements in sound quality of bass. I did my trunk lid first and while it sounded better it seemed to push pressure to the sides of my trunk. This proved it's worth to me with that. I then purchased another trunk pack and did my side panels in trunk along with the trunk floor. I did not cover entirety of side panels I did strip in certain spots, and then majority of trunk floor. After doing side panels and trunk floor I was blown away by the pressure of the bass pushed into my cabin(back seat down). I can do hair tricks (wife won't but I tried a damp rang lol). What I mean is I love that gut punch from the bass and using this in my trunk got me that. Bonus....you get a lot for cheap!!