Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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,
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
haust pipe (rear). <Ref. to FU(STI)-56, REMOVAL,
Rear Oxygen Sensor.> <Ref. to FU(w/o STI)-55,
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
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)
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