I've read that thread. I've also read threads on other forums. The majority of them (including that freshalloy) point back to one 240sx owner who seems to think it's a great idea. Epstein.

There's plenty of guys on other forums saying it doesn't work. Google it. Spend some time researching. It isn't a slam dunk win in favor of foaming the chassis.

And a 3 page article citing the Dow chemical company briefly summarizing the topic isn't exactly the bible. I get it. Some other nerd somewhere else documented that it increased the roof crush load X percent... etc. blah blah blah. The real question is do you feel it from the driver's seat?

And the responses to that vary from individual to individual. We can argue till we're blue in the face, the truth is this. You think it helps, I think it doesn't do shit. I'm not gonna convince you otherwise.