I was asked by sonic electronix to do a review of NVX products again. I have NO PROBLEM doing this as their sound dampner is the best BAR NONE! Doors are heavy as a tank but the sound quality is way better and it didnt flex my roof and absolutely worth every nickel! I own a 99 chevy tahoe and this kit did my whole car pretty much. All 4 doors, the tailgate and rear wheelwells. I put 3/4 mdf wood on tailgate and side wheel wells for better sound travel turning my big truck into a box itself! I cant stress enough how much this made a difference. The ONLY con i have is tha its pretty thick so get the good roller and do every piece correctly. The rep from sonic convinced me to get this instead of dynamat and wow he was right. You get more product and better quality! Im a serious car audio enthusiast and anyone out there that sees this and wants better sound and more spl do what i did YOU WILL NOT REGRET IT! Pound the ground knowing you have full potential of your system! NVX sound dampaner doesnt ever need that second skin stuff i promise! Dynamat is good, this stuff is the best no comparison i guarentee it! 5s all across the board, believe me if i think a product sucks, i will give it to you straight. I only have 2 jlw7 12in with a lil more than 1900watts going to them and this product was the deciding factor of tightness,no rattle, and even keeps heat/cool in or out. Simply amazing. Buy now before prices get jacked up higher than dynamat. I bet spl measure will be higher as well! Thats my guess but my promise is your music WILL sound better and NO RATTLES FELLAS!!!!!!!!!?