Originally Posted by Dustin@Z1

You are correct. On the assembly line, the NISMO Z's do not recieve any additional welds. The older NISMO 350Z's DID in fact recieve additional chassis welds though.

When I was at Tochigi (the assembly plant for Nissan), you could always tell which cars were destined to be a NISM0 on the assembly line. They were the only ones that did not have any of the body work. Apparently the NISMO body work is installed at a different point in the assembly process, different from the standard 370Zs. The same is true for the IPL G37 models.