WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
Special Tool(s)
Fig 1: Identifying Special Tool(s)
Courtesy of FORD MOTOR CO.
Place a straight edge across the exhaust manifold flanges and check for warping with a feeler gauge.