Luke i am running a PWR 500*300*76mm core and the plan is to just leave the front panel standard, see what inlet temps are like, and if it really needs to be done, find an inventive way of getting a bit more air to the cooler. Just see how you go first.
Josh i love the look of your fuel setup. I was under the impression that fuel cells were illegal for road use? Goodluck with the rest of the project, not that it looks like you need it

nigel