Take the piping off from the charger to throttle and give a good look over. Just make sure everything is tightened up when you re-assemble it. You can use a solution of fairy liquid whilst the engine is running but its pretty crude and avoid getting it on the electrics and belts. The next thing I would try is slacken the belt off and check each pulley for play. When I had my Vortech on I went through a water pump and an alternator, causing a loss in boost.