What he said.
As far as stiffenning the chassis goes, there are only 2 things that work : seam welding, roll cage. Try everything else, you will be lucky to get at most 5% of what these do.
Foam is also utter bullshit, as you would have found if you had dug a little deeper. It is very good at making your frame rails rust though.
Finally, no, you dont want a stiffer chassis. Unless you plan on racing with big sticky hoosiers, you don't, really.
Your car drives fine, so drive it.
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