hey and thanx for all previous help... my donald duck luck seems to follow me

problem is: i get no power outta the engine,allthough the turbo builds up pressure at 0,5/0,6bar... and when the engine gets ressistanse and turbo-pressure is gaining,, it starts to make this sound (metal-sound)..
this happened suddenly....(not while driving)
The car starts without any problems and runs very well..
It does smoke a bit though
And the engine is an 13b turbo and ported(88mod)

I have tried:
-the cars battery had been empty (recharged it)
-we tried another (used)turbo to see if that was where the sound came from, but results... the same
-the exhaust manifoil has an external(waste-gate?) , closing-lip on this has been removed..(it was loose)
-i have made sure that it gets enough gasoline
-checked the ignition timing to
-checked the compression in the engine(same on both rotors both up and down)

Wonders:
-could it be the external wastegate
-could it be that both turbos is no good
-could it be ignition noise in the engine
-could it be that the computer needs to be reset
-what if and how and why me.........