Review on Siless 80 Mil (2Mm) 36 Sqft Car Sound Deadening Mat - Butyl Automotive Sound Deadener - Noise Insulation And Vibration Dampening Material (36 Sqft) by Joseph Long

I was on the fence about buying this brand. Mainly because its way cheaper than the competitors. I ordered 4 boxes for my 2015 Colorado just incase, and I completely filled the roof, entire cabin, and all four doors with 3 boxes. The muffler drone is drastically reduced and I can listen to my radio at lower levels than before. This project is not for the faint of heart. If you're thinking of doing it take a list of all the nuts and bolts you have holding down your center console, headliner and seats. Definitely recommend this product. I completed this installation in 40° weather with no issues, and I didn't notice a smell like other buyers stated in other posts.