I put dynamat on the firewall floor and back of the cab(no gas tank there) and recently when I put my new doors on i put it in them too. Its quite a bit quieter but you have to make sure and get all the seals replaced so you dont have sound leaking in and driving you nuts. Definetly worth the effort though.
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68 long fleetside C-10, '74 350, CH465 4-speed, Edelbrock Performer 1406 Carb, Hedman Hedders, 50 Series Flowmasters
Mesa, AZ
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