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Message: <blockquote data-quote="wash" data-source="post: 1136412" data-attributes="member: 18190">As for the foam, Ford did it and some Japanese manufactures do it too.  It might be an afterthought or a quick fix if they don't want to re-tool but evidently it works and being foam it probably doesn't weigh too much.  It makes sense from a torsional standpoint, the rockers are not seamless round tube so they don't transform twisting loads in to pure shear stress on the surface.I don't have track experience but since my car will mainly be used on the street, I don't think that is very relevant. I do have experience cutting a race car in half and welding it back together again, I think that  is a lot more relevant.I have driven enough cars on the street to tell that my Mustang could stand to be stiffer and I've never heard anyone say a stiff car is slower than a flexible car. I'm going to be working on the chassis and I want to make sure it is as good as I can make it before I touch up the paint and reinstall all of the flammable things that you take out for welding. I know chassis stiffening isn't relevant to some kinds of racing because its against the rules and that is why I'm not building for any racing class.  I want it my way, not pushed to some funky configuration for points or de-tuning my engine to make a power to weight ratio.</blockquote>