From what I have read on the subject, don't you mostly just stitch weld from the firewall back, and from the gas tank forward (ie mostly the cabin area). Yes, I know you weld under the body and so forth, but if you do the cabin I don't think it would effect crumple zones what-so-ever. Again, I would think the crumple zones are mostly ahead of the firewall and behind the rear passenger compartment. Though, if you stitch weld past that for maximum rigidity, I would not be sure what it would effect. I do not have enough knowledge on the placement/functionality of crumple zones to validate anything on the subject. Just merely stating what I have read.
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