Nice work, I can also recommend a lightweight crank pulley while you down there too - very noticeable gains in engine pick up throughout the rev range and driveability.
Don't apply for a job at a fact checking firm ay
https://www.z1motorsports.com/front-bbk/nismo/2023-nissan-nismo-15-big-brake-upgrade-front-p-50672.html
This kit includes everything you will need to swap your front brakes to the NISMO Z 15" front brakes.
You very well could be fella, however the comment "thought they were the GT4's" makes it hard to believe you've seen them as the GT4's wheels are 18' all round
I have one hooked up to the PCV valve and have done for years and years. Currently plumbing a 2nd one to the pre throttle body intake, so both banks are looked after and the intake receives all filtered air.
That you thought these came on the GT4's, doubt you've ever seen these in the flesh as you'd know for sure. Also gen Nismo wheels are 18' front and 19' rear, very unusual for Nissan's