Ford 2003 Mustang Workshop Manual page 1332

74. NOTE: RH exhaust manifold shown, LH similar. Tighten the bolts in the sequence shown.
Install the LH exhaust manifold.
75. Connect the lower end of the EGR tube to the LH exhaust manifold.
76. Inspect the O-ring seals and install new O-ring seals as necessary.
77. Install the water bypass tube.
1. Instal the bypass tube.
2. Install the nut.