Chris, are you sure the Ford's were turbo charged on dirt? I have several pictures, and some up close and personal looks at several, and I don't see any routing of the exhaust to a turbo, maybe they had it hid good! I do happen to have a "heat deflector" that Foyt tried to pass off as a heat shield at Indy, they deemed it a "wing", and made him remove it. Good luck! Bob!