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Message: <blockquote data-quote="Jrgunn5150" data-source="post: 358389" data-attributes="member: 9682">I have no idea what effect it will have on structural rigidity, they claim an increase of 40%. They make the stuff though, so they are biased.People who have done it claim they have no more creaks and rattles. That can easily be explained by the foam, nothing is able to squeek or rattle encased in foam.Now as for the foam itself, it IS called structural foam for a reason, it's often used in building construction, boat's, and lately vehicles.I don't think it will replace subframes or anything, but personally I am somewhat fanatical about chassis rigidity. Everyday you drive around with subframes, your car is bowing down more and more. I hate it, I intended to do through the floor connectors on my car. I would have been a PITA to pull the old MM full lengths and cage to do it though, so I was putting it off.</blockquote>