Ford 2003 Mustang Workshop Manual page 1250

30. NOTE: LH shown; RH similar.
Using a suitable container, drain coolant from the engine block.
Install the drain plugs when finished.
31. Remove the four bolts and the power steering pump.
RH cylinder head
32. Remove the RH exhaust manifold.
1. Remove the RH exhaust manifold nuts.
2. Remove the RH exhaust manifold.
3. Remove the RH exhaust manifold gasket and discard.