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Message: <blockquote data-quote="Burninrock24" data-source="post: 1138449" data-attributes="member: 18179">I will admit, I've never heard of filling the hollow points in the chassis urethane foam, turns out Chrysler released a report on it and reported chassis rigidity improved by 30% on their SUV models. So we probably won't see as big of gains, but I'm sure it would still be noticeable. <a href="http://papers.sae.org/1999-01-1785/" target="_blank">http://papers.sae.org/1999-01-1785/</a> it's behind a paywall, but there for those interested. I most definitely will be doing this on my race car. Chrysler reported that 2lb/ft^3 foam showed gains, but maximum gains were found with 16lb/ft^3 foam with heat triggered expansion. Also, making sure that each area is absolutely dry, any moisture will turn into mold or rust quickly, and theres no going back once the foam is injected into the chassis.</blockquote>