Dude, they did a ninja edit on their article! I wasn't imagining things. This is the article where I read about the seam welds.
2009 Nissan Nismo 370Z - 2009 New York Auto Show
And this is a quote from their original article:
Quote:
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Underneath its showy aero bits, the 2009 Nismo 370Z is no less hard-core than the 350Z Nismo. Autech still takes the standard Z-car chassis off the assembly line and welds the seams of the unit body by hand — a labor-intensive process that increases structural rigidity beyond that of a normal, spot-welded unibody. Mass dampers are then fitted between the unibody's left and right frame members to control the extra vibration inherent in a seam-welded chassis.
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Which they now edited to read:
Quote:
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Underneath its showy aero bits, the 2009 Nismo 370Z is a pretty hard-core machine. It's not seam-welded like the 350Z Nismo, but its chassis has been stiffened to the point that mass dampers have been fitted to control vibration.
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Check out this sticky. The full original article is quoted in the sticky.
2009 NISMO 370z Pictures from Edmunds 04.07.09