I Bought a original Garrett Turbo catridge from the local Garrett dealer, it cost 1/4 of a reconed turbo, and it only took an hour to install the new catridge. I have now been driving 2 mounths whithout smoke. The whole operation to remove the turbo, replace catridge and re-install the turbo took me 6 hrs in total on a Mazda 6 MPS.
After the installation the performance increase and gave me 500 rpms in the bottom and pulls to red line, where it stopped at 5500 rpm.
I am using an ATP downpipe, that caursed the hole smooking problem.

It is a cheap alternative to a new turbo.