Ford 2003 Mustang Workshop Manual page 1016

5. Tighten the bolts in three stages in the sequence shown.
Stage 1: Tighten the bolts to 20 Nm (15 lb-ft).
Stage 2: Tighten the bolts to 40 Nm (30 lb-ft).
Stage 3: Tighten the bolts to 50 Nm (37 lb-ft).
6. CAUTION: Do not loosen all of the bolts at one time. Each bolt must be loosened
and final-tightened prior to working on the next bolt in the sequence.
NOTE: The short bolts are numbered 2, 4, 6 and 8 and the long bolts numbered 1, 3, 5 and 7.
Loosen, then tighten the bolts in two stages in the sequence shown.
Stage 1: Tighten short bolts to 25 Nm (18 lb-ft), then tighten an additional 180 degrees.
Stage 1: Tighten long bolts to 45 Nm (33 lb-ft), then tighten an additional 180 degrees.
7. Install the exhaust manifold studs.
8. Install the bracket and bolts.