Subaru 2009 IMPREZA Service Manual page 330

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B: INSTALLATION

1) Install the front oxygen (A/F) sensor and rear ox-

ygen sensor to the front exhaust pipe. <Ref. to

FU(H4SO)-41, INSTALLATION, Front Oxygen (A/

F) Sensor.> <Ref. to FU(H4SO)-43, INSTALLA-

TION, Rear Oxygen Sensor.>

2) Install the front exhaust pipe to center exhaust

Use a new gasket.

Tightening torque:

40 N·m (4.1 kgf-m, 29.5 ft-lb)

3) Install the front and center exhaust pipe to the

vehicle as a unit.

Use a new gasket.

4) Temporarily tighten the nuts which hold front ex-

haust pipe to cylinder heads.

Front Exhaust Pipe

5) Install the center exhaust pipe to rear exhaust

Use a new gasket.

Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

6) Tighten the bolts which hold center exhaust pipe

to hanger bracket.

Tightening torque:

35 N·m (3.6 kgf-m, 25.8 ft-lb)

7) Tighten the nuts which hold front exhaust pipe to

cylinder heads.

Tightening torque:

30 N·m (3.1 kgf-m, 22.1 ft-lb)