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..
my evo 3 was workin so sweet until the timing belt burst. damage some valves. i replace the bent valves and bolt back up the head.all the mating marks are dead on but the car not running how it use to. i double check...