god dammit, you lot were all right, i sold my forge, got my standard recirc back and yeah it was jammed. luckilly i got a standard one off a 225bhp audi tt, works fine.
would my engine fail quickly if i put the old recirc on that chattered, i presume its the turbo getting the boost forced back through it.
my mates cossie makes the same noise and i love it.