Esiest thing is to tghten all ur piping's rubber. If cannot, dismantle ur intercooler and suppress into water to check for bubbles. if alot comes out then throw away & go buy a trust intercooler (Joking).. Easiest way is to bring it to an experienced mech of radiator sifus..
Just Last week coming down from half cut shop ...Rx7 Fc mk5 half cut ,knightsport turbo ,ecu knightsport,trust intercoller,greedy water temp,hks i/coller paiping ,front bumper r-magic face ,absorber 1set...