ok my ute is fitted with a (I think) process west stage 2 cooler which renders the over the radiator un-useable. should I block the intake to the airbox off to prevent hot air getting in or will it cause to much of a restriction to block this?

Block what intake?

If you throw up some pics of the setup it might be a little easier to help out

If you have a snorkel fitted to the front of the airbox yes block it off , if you don't, don't

Yeah blcok it off and use the F6 CAI at the front... or use some flexi ventiation hose and run it off the opening and down to the front

Why not run a F6CAI and the snorkel???

the intercooler kit requires the removal of the snorkel so all im left with is the f6 intake and the hole for ther snorkel in the side of the box.

so blocking it off shouldnt pose a problem then?