I think sound deadening in a 370z is more than worthwhile. I know some like the sound of the car as part of the driving experience, but I like to listen to music or converse with greater frequency than listening to the roar of exhaust. Plus, I can always lower a window and I get the sound effects back.
One place were the deadening made a HUGE effect was over the wheel wells. The Z really throws up a lot of grit and small road debris and I got tired of the "pinging" sound. The butyl film helped a bunch. I was thinking of finishing it off with the exterior paint on material. Not sure if anyone has done this and how much difference it makes. Also, what about durability?
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