KILMAT 80 mil 36 sqft Car Sound Deadening Mat, Butyl Automotive Sound Deadener, Audio Noise Insulation and dampening

I used this on the rear deck of a 2019 acura tlx with a kicker 8 inch sub driven by 200 watts rms. The metal was flexing very badly and the noise from vibration was horrendous. One layer of killmat completely silenced it.

Used these to settle down the vibration on my hood, trunk lid, etc. after I changed my OEM engine mounts to less squishy custom mounts. Highly recommend.

Doing the floors in my 1966 Chevy. POR 15 first then Kilmat. Easy to work with and priced right