July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Exhaust Manifold - Inspection
WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Special Tool
Courtesy of FORD MOTOR CO.
Place a straight edge across the exhaust manifold flanges and check for warping with a feeler gauge.