When I first got this product, I wasn't really sure on how much it would reduce distortion from my trunk. When I stretched it out, it wasn't able to cover my whole trunk but, I must say that applying this on really improved the sound quality in my system. the rattle from the trunk has completely stopped and now I just have to make it so my license plate will stop rattling as well. This Dynamat is worth every penny and you wont be able to buy this any cheaper than here. I went to C***** C*** and B*** B** and their prices ranged from $45-$55. So save money and buy here on Sonic. Also, some people may say to get the rubber roller but I just used the back end of my screw driver and it worked just fine with applying this product onto my trunk lid.