im using a big ARC return flow dont know to much about them but have heard after a car was tuned by trent after 15 runs the intake temps didnt change at all
and have seen a few results make over 300rwkw with no problems
havent looked into the other brands much so cant really comment on them and i cant say if i noticed a difference as my car came from japan with it fitted
but when my car was stock with full 3 inch stainless dump pipe and exhaust,metal intake pipe 9psi i raced my friends r33 with excatly the same mods except the intercooler he was using a just jap one
head to head i was 2, 2.5 car lengths in front
not sure if that was the coolers doin or not
hope this helps