We have a 1x Intake mod rule. Pretty self explainitory - you can only make ONE modification to the intake. If you had a normal A2A I/C, and an airbox. You'd be 100% legal. So for any R33 GTS-T owner, that is a FMIC given stock one is rubbish.
So when people put on Pods, yes it's a defect - BUT it's a very simple fix.
If you get pinned you have to:
1. Take the entire W2A setup out
2. Re-install stock airbox & I/C (cause both need to be present to be legal)
3. Clear defect
4. Re-install the lot
That is a hell of a lot of studding around for a street car.
Indeed it would fit that part easily... HOWEVER you'd still realistically need to mount a decent radiator for it into the front bar section, then mount the pumps, lines & storage. So it would still limit flow to the radiator somewhat with a W2A rad core @ the front.
Overall to setup W2A would be harder than A2A without a doubt, and obviously weigh more due to having the water weight.
Not disputing though that W2A would be better at cooling over A2A, no doubt about it.
It's just dependand on whether you can get the setup correct (i doubt a $400 ebay kit will work decently).
And then eat the hassle of a defect if you get pinned.
Side point flow to the raditor shouldn't be of a concern. 380rwkw GTRs with upgraded radiators & FMICs run acceptable temps on a 30 degree day. If you are having temperature issues then the first port of call would be a decent radiator & ducting.
Going W2A won't fix any overheating issues of the car cooling system (if you are trying to fix this?).