Do they:

-do they start life as a regular Z and come off the same production line and then get shipped to Autech?

-do they come off a separate production line and then get shipped to Autech?

-does Autech build them from the ground up separate from any other Nissan factory?

 

Not sure if Autech is a separate facility or part of the Z33 factory. They did pull the Z33 chassis off the line and seam welded parts of the chassis.

 

One of the significant modification not usually mentioned by most reviews about the 350Z Nismo are the structural improvements made to the car. Autech welds up the seams in the Z-car's unit-body chassis, a familiar racing practice that adds more structural rigidity to the Z-car's chassis than the conventional spot welds from the Nissan assembly line can provide. The usual strut-tower braces further improve chassis stiffness. Even more body rigidity comes from Autech's innovative use of special pieces beneath the Z-car's unit-body. Special mass from Yamaha are mounted between the left- and right-side frame members to resist flex and vibration.

The 2007 Nissan 350Z Nismo sits on strong yet lightweight forged aluminum wheels that carry Bridgestone RE-01R tires, 245/40R18s in front and 275/35R19s in the rear.

Through the racing program for the Autech-prepared Z-car, Nissan's design group and vehicle testing department developed a special complement of bodywork pieces, and Autech has turned them into production pieces for the 2007 Nissan 350Z Nismo. These pieces include a front aero splitter, front and rear bumper covers, rocker-sill extensions and a dramatic rear wing.

 

Autech is a completely different facility, and I believe Autech assembles the entire car at their facility after the chassis is received from the nissan plant.

 

Well said.

 

That was copied and pasted, just so you know.