Ford 2003 Mustang Workshop Manual page 1110

56. Install the lower intake manifold bolts.
Install the six long bolts.
Install the eight short bolts.
57. Tighten the bolts in two stages in the sequence shown.
1. Stage 1: Tighten to 5 Nm (44 lb-in).
2. Stage 2: Tighten to 10 Nm (89 lb-in).
58. Install the heater water outlet tube.