In response to the above post about the turbo mustang with stainless headers. A race car is experiencing much diffrent heat cycles than a street car. Think about it for a second, a race car is started and raced for a day and then shut off. While the street car is turned on shut off, on and on all day long. This really causes alot of expanding and rapid contraction in the stainless material which eventually leads to cracking in the header of the street car. I can see running stainless headers on a N/A car for sure but not a street turbocharged car.