Hi, chaps. I am really hoping someone can help me out here. I have a phase 2 gt turbo, and every time I am on rundown, the car throws out thick black smoke. I know it's the valve stem seals on the car and have had the head off 3 times to try and fix it. I have been informed by my mechanic that the productions of the 5 seals have changed, and they no longer work as they should. The only fix left is to have the head machined out to take bigger stem seals. I understand this is an issue that all 5 owners will face in the future and wonder if anyone has any solutions. Ie somewhere that manufactures stem seals. I am lost as to what else I can do. I have spoken to numerous tuning company's and they are aware of the issue and say that currently there is not a solution to fix it. Any help will be greatly appreciated