know what your going to say....... leaky intercooler pipe / joint. well ive checked all the joints and the intercooler and cant see anything. its not a bad noise and only started doing it since i sorted the split intercooler pipe and change manifold.and put on a trick up pipe am wondering if it something to do with the up pipe changing the note? you would almost think it was a air leak squeel but its not. only does it out on the road and when its under load and starting to boost up?