they said the new Z was stiff enough and no body stiching was required. the added weight of the welds was not benificial....
read that somewhere...
Though the body of the 2007 Nissan Nismo 350Z was seam-welded like that of a racing car, the 370's only additional structural enhancement is a different front strut-tower brace. "This car's stock body is stiff enough to meet the additional demands placed on it by the Nismo hardware," says Nathaniel Mason, senior manager of product planning in Nissan's Specialty Vehicles division.
http://www.edmunds.com/apps/vdpconta...9/pageNumber=1