Trust me you would be able to hear this on your car if you had the same problem. To be honest Im not sure if I have the c-clip on there still, the rod looks like its welded together, I couldnt get it off yesterday since it started raining as soon as I got home so I just shot it with some penetrant. I'm still not sure wether the problem is the wastegate not fully closing or a broken spring or diaphram in the WGA as for some stupid reason I thought it opened by vacuum, so today I have to find an air source to apply 10psi and see if it moves when it should and if it holds some pressure.
BTW if it is the WGA diaphram/spring would that cause ALOT of lag and low boost? Like I dont even start building boost until about 3000RPM and maybe hit 5 or 6 psi by like 4800-5000RPM in 1st, never above 5psi in any other gear/rpm. Ive replaced all vacuum lines, made a new gasket to go between the compressor inlet and housing, checked the IC hoses, checked/tightened all exhaust bolts, vam hose is cleaned/tight, replaced pcv and added a villager checkvalve. Oh and the compressor has a very small amount of play maybe a few thousands end play and a few thousands side to side, there are a few small scuff marks on the housing but for a turbo with 250,000km on it, I'd expect a little wear and tear in there. Im not too sure about the BCS though as it looks like it has been taken apart in the past since the retaining tabs are broken on it.