The 350Z Nismo got chassis reinforcements (seam welds). I don't believe any version of the 370Z Nismo got additional chassis reinforcements. IIRC, Nissan claimed the 370Z chassis' rigidity surpassed that of the 350Z Nismo, and they never went any further with that.
The 2015+ Nismo got different final drive ratios, with the most aggressive change being in the 7AT version. The 6MT still gets a bump from the regular sport version. I don't know what the ratios are and I'm too lazy to google them right now.
The Rays Wheels on the Nismo 370Zs are wider for both front and rear, but I don't know if they're lighter than the sport package rays. They're probably lighter than the cast 18" wheels on the base models though.
Suspension is definitely stiffer on the Nismo. I want to say sway bars are different as well, but I might be making that up.
Brakes - on a standard Nismo they're no different than a sport package, however, you can equip the optional "Nismo R Tune" pads and some fluid, but honestly, I'd save the extra cash for some Motul RBF600, Carbotech pads, and a set of SS lines.
The exhaust is not titanium on any version of the 370Z. You might be thinking of the GT-R Nismo there.
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