all ok, we had to take the inlet manifold off as there was a water leak from one of the pipes that, like to cause you untold greif to get to. we nailed it back together using instant gasket... hmm that worked.!
so after i spat that out, along with all the water, i took it to my tuners, he put the head gasket back & nailed it all together again, then this noise started.. a small murmurr, now a good wacker of one..
just a screach as it's boosting.. no loss of power, no visable adverse effects..
just this noise, painfull it is.