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Message: <blockquote data-quote="Burninrock24" data-source="post: 1137690" data-attributes="member: 18179">Well I mean if you're willing to put the time in, then more power to you! But what I'm understanding is that a lot of areas you're correcting aren't the main causes for chassis deflection. Look at it in a hypothetical percentage way, chassis stiffness only accounts for say 35% of your handling capability, the rest comes from proper geometry, control arms, spring rates, ride height, tire pressures, etc. So by seam welding and spraying expanding foam will improve chassis rigidity by even 2%, then you're only improving your overall handling capability by 0.7% Your biggest gains in chassis rigidity will come from upper and lower welded subframe connectors and fortifying the torque box. And even then, you could achieve much more rigidity by welding in a tubular roll cage or pre-loading a shock tower brace and welding that in place. Any sources of other people using this foam? Or any other methods you've mentioned? Just keep in mind that every time you drill a hole or make a cut in the existing frame you risk weakening the overall structure. Also, how do you plan on measuring chassis deflection?</blockquote>