Quote:
Originally Posted by Cbtech
which one of these has the best sound deadening ability?
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If you will not be completing the project with closed cell foam and mass loaded vinyl, our Ultra or 110 products would be recommended. These are both asphalt based alternatives, however, and are advised to be installed away from the engine bay as much as possible. If you will be installing around firewalls, I recommend the Onyx product as it is butyl and has a far superior heat resistance.