For 1990-2009 cars

### Installation Procedure

Notice: Refer to Fastener Notice in the Preface section.

1. Install new exhaust manifold studs.

Tighten
Tighten the exhaust manifold studs-to-cylinder head to 10 N·m (89 lb in).

2. Install the new exhaust manifold gasket.
3. Install the exhaust manifold to the cylinder head.
4. Install the exhaust manifold to cylinder head retaining nuts. Tighten the nuts starting from the center and working outward.

Tighten
Tighten the exhaust manifold-to-cylinder head nuts to 12 N·m (9 lb ft).

5. Coat the threads of the oxygen sensor with anti-seize compound P/N 12397953.
6. Install the oxygen sensor.

Tighten
Tighten the oxygen sensor bolts to 30 N·m (22 lb ft).

7. Install the engine block heater, if equipped.

Tighten
Tighten the engine block heater bolt to 10 N·m (89 lb in).

8. Install the exhaust manifold heat shield.
9. Install the exhaust manifold heat shield bolts.

Tighten
Tighten the exhaust manifold heat shield bolts to 23 N·m (17 lb ft).

10. Install the air pipe gasket (4).
11. Install the air pipe (2).
12. Install the air pipe bolts (3).

Tighten
Tighten the air pipe bolts to 25 N·m (18 lb ft).

13. Install the air pipe nut (1).

Tighten
Tighten the air pipe nut to 16 N·m (11 lb ft).