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..
interest for sale my car 3SGE engine(m)blizt twinplate clucth with flywheel(6kg) aluminium crank bulley new timing belt, engine overhal clean, hks air filter. i dunno can selling how much just waiting reply