Thanks Simon, this is new thinking.
I agree with the possibility of the wastegate.....but.....
Watergate....this is a new term. What the heck is watergate?
We thought about this possibility too, the turbo and waste gate is brand new, moreover a leaking turbo waste gate should not remit any air leaking noise neither. Anthony did try to check to see if the waste gate was not fully closed, except that it was not the usual waste gate that we were accustom to, but more like an integrated unit without any adjustment rod.