The Nismo 350z unlike the Nismo 370z actually had alot of work done to it. Autech seam welded the chassis and it had significant reenforcement over stock. Engine however was basically regular HR era 350z hardware. In Japan there was even a 350hp “380RS” version that retailed for $40k. They should have sold that here lol. The body work on this car significantly improves downforce, it’s basically a handling car like you would think such a thing should be.
The Nismo 370z was the opposite. Not much work done on the chassis but a slight horsepower bump.