What wheels do you have?
GTS-t = 16x6.5, 205/55 tyres
GT-R = 16x8, 225/50 tyres
from memory
I recommend: https://www.tyresales.com.au/buy/tyre/bridgestone/potenza_adrenalin_re003/205-55r16/126037?q=4&delivery=NSW
or
https://www.tyresales.com.au/buy/tyre/michelin/pilot_sport_4/205-55r16/161279?q=4&delivery=NSW
sadly Hankook V12 are out of stock, as that's what I run on my turbo Liberty and highly recommend them.
You can try to find a flasher relay that's "LED compatible", or run load resistors (half defeats the purpose IMO).
I got some Philips resistors if you're interested (I bought TapTurn relay).
CANbus is for newer cars that would throw an error light if a bulb was out.
I haven't looked at R32 headlights in a while (shame on me) but that could be the high beam reflector?
As for LEDs, I personally wouldn't bother unless they're using Koito projectors, but I guess if you want a bolt on solution it'll do.
Did it come with this thing?
Also the projectors are junk, you've be much better off retrofitting with proper HID projector. Even bunging in an adaptor plate for H1/H7 etc halogen buib into said HID projector will be an upgrade.
My GT-R did 10L/100km once. But usually it does 14L (when I daily drove it).
My Liberty does 11L average, stop-start kills it (which is why hybrid cars makes so much sense in cities/suburbs).
Always fill 7 Eleven (Mobil) 98.
It makes sense to try difference sources of fuel. Also fuel can vary between stations, so brand doesn't usually matter. Except if it's Caltex or United, not putting that crap in my cars (I don't need ethanol fuel).
Those are Nismo sizes. Basically spot on for RWD Nissans. It's not vapenation tyre stretch spec so search on the internet for Nismo wheels on Silvias and Skylines.