Its very simple what he is trying to say. He bought some rebuilt turbos from COZ and they were leaking to probably a poor rebuild job. But we know the story on rebuilds don't use them period. Apparently he tried to speak to COZ and they said the turbos were fine after he returned them and tried again to install them with the same results.
He went and purchased a set from Z1 and all his troubles went away. Negrito said don't buy from them to avoid loosing your money.