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i did the same thing to mine too. except i did the front part where the driver and passenger foot are. i completely noticed a sound deadening difference. i believe i used the exact same carpet underlay. i just never did the rear area. this is a good idea, i was thinking of using dynamat over the rear wheel wells. maybe this summer ill use dynamat, and maybe that firewall material they use. i was thinking of using that firewall material and 3M glue it to neoprene i might get a decent sound absorber to line those parts.
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