Amazon: 2 In Stock
https://www.amazon.com/Invidia-HS02N3ZGID-Cat-Back-Exhaust-Titanium/dp/B0051D34Q8/ref=sr_1_1?dchild=1&keywords=Invidia+350z&qid=1628012417&sr=8-1
I know you didn't ask but.... have you heard this exhaust? It's slightly above stock as far as sound goes. I had it and sold it for the HKS exhaust. It does sound deeper than stock but it is not loud at all.
They're currently out of stock though
This is what I have. Keep in mind I have an 08 which is a different engine than the 03-06 models. Also the transmission set up is different as well. The 07-08 models have their slave cylinder located inside the bell housing. Keep in mind the stock flywheel is dual mass and pretty heavy so if you go with a lightweight flywheel you are going to need to upgrade your slave cylinder and also expect some flywheel/clutch chatter at idle and low rpm. Also you will have a single intake where as the 07-08 have dual intakes. The parts I am posting are also made for your year Z as well though just make sure you get the proper part for your year model.
https://www.amazon.com/Invidia-HS02N3ZGID-Cat-Back-Exhaust-Titanium/dp/B0051D34Q8
https://www.z1motorsports.com/air-intakes/jwt/jwt-dual-pop-charger-intake-07-g35g37-p-3820.html