i had a radtec 60mm on my last saph 2.2 bar t4, water injection was set to start at 44c and it would frequently be on in summer.

my advice would be go jap design, they sit low in the bumper, ive got a 120mm deep hks intercooler on my car and frontal area is bigger than an rs500 one !
on a 20c day act temps hold 38c at 160 mph at 870 hp, i have water injection but it isnt plumbed in as its not needed yet.
its to late now but i sold my gtr blitz one for £300 that was 110mm thick and was breezing 570hp never saw above 30c.