I understand what you are saying but the bracket has a bias in it when it leaves the factory as anyone who has tried to re-install it on a stock car knows . It is not like Porsche to add a bracket that doesn't do anything. I can see in your case where you have very little weight on the turbo exhaust leg that there would not be much leverage from a big muf/tailpipe to apply a force to the turbo flange area. There is also the gyroscopic force from the turbo spinning at 25,000 plus rpm. I agree that headers are consumables and should be replaced as such but cracks are another issue. Your reply is another piece of the puzzle concerning cracks and if we all respond with each of our experiences with and without the bracket, we might be able to come up with some useful info on header cracks.