restricting

in the early hours last night i had a 'jaunt' up the motorway with my mate in his clio t, after a few miles he rang me up and said the inners of my back box are glowing red hot, i'm wondering if it is one of two reasons; the exhaust is restricting airflow so is generating excess heat? or...

From all the pictures i've seen of the Forge FMIC it seems to be mounted directly infront of the radiator which will restrict airflow to the radiator. Has anybody noticed increased water temperatures since having a FMIC and do you have any problems during the hot summer with the cooling fan...