Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 90

EX(STI)-8

Center Exhaust Pipe

EXHAUST

3. Center Exhaust Pipe

A: REMOVAL

CAUTION:

Vehicle  components  are  extremely  hot  after

driving. Be wary of receiving burns from heated

parts.

1) Disconnect the ground cable from battery.

2) Remove  the  intercooler.  <Ref.  to  IN(STI)-12,

REMOVAL, Intercooler.> <Ref. to IN(w/o STI)-12,

REMOVAL, Intercooler.>

3) Lift up the vehicle.

4) Remove  the  transmission  under  cover.  (6MT

model)

5) Remove the bolts which secure the lower side of

the turbocharger lower cover.

6) Lower the vehicle.

7) Remove the turbocharger upper cover.

8) Remove the bolts which hold the upper side of

the turbocharger lower cover.

9) Remove the upper side bolts and nuts that hold

the center exhaust pipe on the turbocharger, and

remove the turbocharger cover stay (A).

10) Lift up the vehicle.

11) Remove the lower side nuts (two places) that

hold the center exhaust pipe on the turbocharger.

12) Disconnect the connector from the rear oxygen

sensor, and remove the clip (A) holding the rear ox-

ygen sensor harness.

• 5MT model

IN-00203

EX-02255

EX-02662

EX-02762

EX-02464

(A)

EX-02339

FU-04637

(A)

EX(STI)-9

Center Exhaust Pipe

EXHAUST

• 6MT model

13) Remove the rear exhaust pipe from center ex-

haust pipe.

14) Remove  the  bolt  which  holds  center  exhaust

pipe to transmission.

15) Remove  the  bolt  which  holds  center  exhaust

pipe to hanger bracket, and remove the center ex-

haust pipe.
CAUTION:

Be careful not to drop the center exhaust pipe.

16) Remove the turbocharger lower cover.

B: INSTALLATION

1) Set the turbocharger lower cover, and temporari-

ly tighten the bolts that hold the lower side of the

turbocharger lower cover.

2) Install  the  center  exhaust  pipe  and  temporarily

tighten the bolt which holds center exhaust pipe to

hanger bracket.

3) Temporarily tighten the bolt which holds the cen-

ter exhaust pipe to the transmission.

4) Install the center exhaust pipe along with the tur-

bocharger cover stay (A) to the turbocharger.
NOTE:

Use a new gasket.
Tightening torque:

42.5 N·m (4.3 kgf-m, 31.3 ft-lb)

5) Install  the  rear  exhaust  pipe  to  center  exhaust

pipe.
NOTE:

Use a new gasket.
Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

EX-02331

(A)

EX-02229

EX-02182

EX-00209

EX-02339

EX-02464

(A)

EX-02229

EX(STI)-10

Center Exhaust Pipe

EXHAUST

6) Connect the connector to the rear oxygen sen-

sor, and hold the rear oxygen sensor harness with

the clip (A).

• 5MT model

• 6MT model

7) Tighten the bolt which holds center exhaust pipe

to transmission.
Tightening torque:

30 N·m (3.1 kgf-m, 22.1 ft-lb)

8) Tighten  the  bolts  which  secure  the  center  ex-

haust pipe to the hanger bracket.
Tightening torque:

35 N·m (3.6 kgf-m, 25.8 ft-lb)

9) Lower the vehicle.

10) Attach  the  bolt  which  holds  the  upper  side  of

the turbocharger lower cover.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

11) Attach the turbocharger upper cover.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

12) Lift up the vehicle.

FU-04637

(A)

EX-02331

(A)

EX-02182

EX-00209

EX-02762

EX-02662

EX(STI)-11

Center Exhaust Pipe

EXHAUST

13) Tighten the bolts that secure the lower side of

the turbocharger lower cover.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

14) Install  the  transmission  under  cover.  (6MT

model)
Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

15) Lower the vehicle.

16) Install the intercooler. <Ref. to IN(STI)-13, IN-

STALLATION,  Intercooler.> <Ref. to IN(w/o  STI)-

12, INSTALLATION, Intercooler.>

17) Connect the battery ground terminal.

C: DISASSEMBLY

1) Remove the rear O

2

 sensor from the center ex-

haust pipe (rear). <Ref. to FU(STI)-56, REMOVAL,

Rear  Oxygen  Sensor.>  <Ref.  to  FU(w/o  STI)-55,

REMOVAL, Rear Oxygen Sensor.>

2) Remove the center exhaust pipe upper cover.

3) Remove the center exhaust pipe (rear) from the

center exhaust pipe (front).

D: ASSEMBLY

1) Assemble the center exhaust pipe (rear) to the

center exhaust pipe (front).
NOTE:

Use a new gasket.
Tightening torque:

42.5 N·m (4.3 kgf-m, 31.3 ft-lb)

2) Install the center exhaust pipe upper cover.
Tightening torque:

13 N·m (1.3 kgf-m, 9.6 ft-lb)

3) Install the rear O

2

 sensor to the center exhaust

pipe (rear). <Ref. to FU(STI)-56, INSTALLATION,

Rear  Oxygen  Sensor.>  <Ref.  to  FU(w/o  STI)-55,

INSTALLATION, Rear Oxygen Sensor.>

E: INSPECTION

1) Check  the  connections  and  welds  for  exhaust

leaks.

2) Make sure there are no holes or rusting.

EX-02255

IN-00203

(A) Center exhaust pipe (front)
(B) Center exhaust pipe (rear)

(C) Gasket

(A) Center exhaust pipe (front)
(B) Center exhaust pipe (rear)

(C) Gasket

EX-02741

(C)

(B)

(A)

EX-02742

(C)

(B)

(A)