Impala V6-3.9L (2007)
9. Connect the HO2S electrical connector (3).
10. Install the CPA retainer (1).
11. Lower the vehicle.
12. Install the upper catalytic converter to exhaust manifold nut (1).
Tighten the nut to 35 N.m (26 lb ft).
13. Install the exhaust manifold heat shield.
14. Install the exhaust manifold heat shield bolts.
Tighten the nuts to 10 N.m (89 lb in).