first thing to do is clean all the oil up.............

make sure you clean all the Intercooler pipes as well - inside
have a look at your IC itself, does it have any oil around the edges of the crimping? - your IC is toast if it has, its leaking

have you checked your Fan belts?
I know the Gates belts made funny noises on mine until I replaced them

have you has someone hold the rev's while you stand at the front and tried to pin point exactly where the noise is coming from?