So I took dump, waste gate screamer, heat sheilds and water and oil lines off turbo, removed manifold and turbo as one piece and found bad exhaust leaks on both ends of the Artec manifold. It was still all done up tight and couldnt come loose because I had atomic anchorlox nuts holding it on. Manifold flange is badly warped, banana ed. Very disappointing. Anyway I rang the retailer and they got hold of Artec and lots of photos and emails later Artec sent me a brand new manifold, this one has a flat flange, I checked it. I didnt check the first one when I first got it but it didnt leak until 1500ish kms. So iv installed it all again, I bought new Tinnix inconel studs and new atomic anchorlox nuts and its all go again. I had to send my old warped manifold back. Thankyou Artec for coming to the party.