Just concerning yourself with air temps.........a fenderwell kit is best for lowest inlet temps on the street or track. However it will not flow as well as a straight shot intake located under the hood. I picked up a tenth and 2 mph switching from a fender kit to straight shot kit even with slightly higher IAT's.
Also if you drive on the street with a fender kit you need to pay attention to heavy rain and/or puddles. And you might have tune issues with the MAF being located near a bend in the inlet pipe.
On a side note, KB's warantee states you can ONLY run a fenderwell kit with their blowers because they do not want their blowers injesting hot underhood air, so that is something you may want to consider.
Good luck :thumbsup:
--Joe