Ford 2003 Mustang Workshop Manual page 2952

5. Remove the RH exhaust manifold flange nuts.
6. Remove the LH exhaust manifold flange nuts.
7. Remove the dual converter H-pipe.
8. If necessary, use the center of the LH flange as a baseline, measure 67 mm (2.68 in) and cut
the cross-over pipe.
9. If necessary, use the center of the RH flange as a baseline, measure 83.9 mm (3.35 in) and cut
the cross-over pipe.