Exhaust (h4dotc Engine) Subaru Impreza WRX GD/GG рестайлинг 2

Scheme 13

1. Turbo model (Scheme 13): Exploded View Of Front Exhaust Pipe Components - Turbo Model

Scheme 14

1. STi model (Scheme 14): Exploded View Of Front Exhaust Pipe Components - STi Model

Scheme 15

1. Turbo model (Scheme 15): Exploded View Of Center And Rear Exhaust Pipe, And Muffler - Turbo Model

Scheme 16

1. STi model (Scheme 16): Exploded View Of Center And Rear Exhaust Pipe, And Muffler - STi Model

CAUTION

1. Wear work clothing, including a cap, protective goggles, and protective shoes during operation.
2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
3. Keep the disassembled parts in order and protect them from dust and dirt.
4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly, and replacement.
5. Be careful not to burn yourself, because each part on the vehicle is hot after running.
6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
7. Place shop jacks or rigid racks at the specified points.
8. Before disconnecting electrical connectors of sensors or units, be sure to disconnect the ground cable from battery.

Scheme 17

Scheme 18

Scheme 19

Scheme 20

1. Disconnect the ground cable from battery.
2. Remove the front oxygen (A/F) sensor. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/fuel-system/#fuel-injection-fuel-systems-h4dotc), Front Oxygen (A/F) Sensor. >
3. Remove the under cover.
4. Remove the lower exhaust manifold cover (RH).
5. Remove the lower and upper exhaust manifold covers (LH). (Scheme 17): Identifying Lower Exhaust Manifold Cover
6. Remove the bolts and nuts which hold the front exhaust pipe assembly to turbocharger joint pipe.
7. While holding the front exhaust pipe assembly with one hand, remove the nuts which hold the front exhaust pipe assembly to cylinder head exhaust port. (Scheme 18): Identifying Exhaust Pipe Bolts
8. Remove the front exhaust pipe assembly.
9. Remove the covers from exhaust manifold and front exhaust pipe.
10. Separate the front exhaust pipe from exhaust manifolds. Turbo model (Scheme 19): Identifying Exhaust Pipe From Exhaust Manifolds - Turbo Model STi model (Scheme 20): Identifying Exhaust Pipe From Exhaust Manifolds - STi Model

INSTALLATION

Note. Replace the gaskets with new ones.

Scheme 21

Scheme 22

Scheme 23

1. Assemble the front exhaust pipe and exhaust manifolds. Tightening torque: 35 N.m (3.6 kgf-m, 26 ft-lb) Turbo model (Scheme 21): Identifying Exhaust Pipe And Exhaust Manifolds - Turbo Model STi model see scheme 10: Identifying Exhaust Pipe And Exhaust Manifolds - STi Model
2. Install the front exhaust pipe covers. Tightening torque: Turbo model 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) STi model 25 N.m (2.5 kgf-m, 18.1 ft-lb)
3. Install the upper exhaust manifold cover (RH). Tightening torque: Turbo model 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) STi model 19 N.m (1.9 kgf-m, 13.7 ft-lb)
4. Install the front exhaust pipe assembly. Tightening torque: 35 N.m (3.6 kgf-m, 26 ft-lb)
5. Connect the exhaust manifold (RH) to turbo-charger joint pipe. Turbo model Tightening torque: T1: 35 N.m (3.6 kgf-m, 26 ft-lb) T2: 40 N.m (4 kgf-m, 28.9 ft-lb) (Scheme 22): Identifying Exhaust Manifold Bolts - Turbo Model (1 Of 2) (Scheme 23): Identifying Exhaust Manifold Bolts - Turbo Model (2 Of 2) STi model Tightening torque: 35 N.m (3.6 kgf-m, 26 ft-lb) see scheme 13: Locating Exhaust Manifold Bolts - STi Model
6. Install the upper and lower exhaust manifold covers (LH). Tightening torque: Turbo model 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) STi model 19 N.m (1.9 kgf-m, 13.7 ft-lb)
7. Install the lower exhaust manifold cover (RH). Tightening torque: Turbo model 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) STi model 19 N.m (1.9 kgf-m, 13.7 ft-lb) see scheme 14: Identifying Lower Exhaust Manifold Cover
8. Install the front oxygen (A/F) sensor. < Ref. to «INSTALLATION»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/fuel-system/#fuel-injection-fuel-systems-h4dotc), Front Oxygen (A/F) Sensor. >
9. Install the under cover.
10. Connect the battery ground cable to battery.

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Remove the intercooler. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#intake-induction-h4dotc-engine), Intercooler. >
4. Remove the intercooler bracket. (Scheme 24): Locating Intercooler Bracket Bolts
5. Lift-up the vehicle.
6. Remove the under cover.
7. Remove the bolts which install the under side of turbocharger lower cover. CAUTION: Be careful, the turbocharger and exhaust pipe are hot. (Scheme 25): Locating Bolts
8. Lower the vehicle.
9. Remove the turbocharger upper cover. (Scheme 26): Identifying Turbocharger Upper Cover With Bolts
10. Remove the bolts which install the upper side of turbocharger lower cover, and remove it. (Scheme 27): Locating Turbocharger Lower Cover Bolt
11. Separate the center exhaust pipe from turbocharger. (Scheme 28): Identifying Center Exhaust Pipe From Turbocharger
12. Lift-up the vehicle.
13. Disconnect the connector from rear oxygen sensor. (Scheme 29): Identifying Connector From Rear Oxygen Sensor
14. Vertically draw out the clip from crossmember. (Scheme 30): Locating Crossmember Clip
15. Separate the center exhaust pipe from rear exhaust pipe. (Scheme 31): Identifying Center Exhaust Pipe From Rear Exhaust Pipe
16. Remove the bolt which holds the center exhaust pipe bracket to transmission. (Scheme 32): Identifying Center Exhaust Pipe Bracket To Transmission
17. Remove the intercooler bracket.
18. Remove the bolt which holds the center exhaust pipe to hanger bracket. CAUTION: Be careful not to pull down the center exhaust pipe. (Scheme 33): Identifying Center Exhaust Pipe To Hanger Bracket
19. Remove the center exhaust pipe. (Scheme 34): Identifying Center Exhaust Pipe

Note. Replace the gaskets with new ones.

Scheme 35

1. Install the center exhaust pipe and temporarily tighten the bolt which holds the center exhaust pipe to hanger bracket.
2. Temporarily tighten the bolt which holds the center pipe to transmission.
3. Connect the center exhaust pipe to turbocharger. Tightening torque: 35 N.m (3.6 kgf-m, 26 ft-lb) see scheme 26: Identifying Center Exhaust Pipe From Turbocharger
4. Install the center exhaust pipe to rear exhaust pipe. Tightening torque: 18 N.m (1.8 kgf-m, 13 ft-lb) see scheme 27: Identifying Center Exhaust Pipe To Rear Exhaust Pipe
5. Connect the connector to rear oxygen sensor. see scheme 28: Identifying Connector To Rear Oxygen Sensor
6. Secure the clip on crossmember. see scheme 29: Locating Crossmember Clip
7. Tighten the bolt which holds the center exhaust pipe bracket to transmission. Tightening torque: 30 N.m (3.1 kgf-m, 22.4 ft-lb) see scheme 30: Identifying Center Exhaust Pipe Bracket To Transmission
8. Tighten the bolt which holds the center exhaust pipe to hanger bracket. Tightening torque: 35 N.m (3.6 kgf-m, 26 ft-lb) see scheme 31: Identifying Center Exhaust Pipe To Hanger Bracket
9. Lower the vehicle.
10. Place the turbocharger lower cover, and tighten the bolts which install the upper side of lower cover. Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) see scheme 32: Locating Turbocharger Lower Cover Bolt
11. Place the turbocharger upper cover, and tighten the bolts which install the upper side of upper cover. Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) (Scheme 35): Locating Turbocharger Upper Cover Bolts
12. Lift-up the vehicle.
13. Tighten the bolts which install the under side of turbocharger lower cover. Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb) see scheme 34: Locating Turbocharger Lower Cover Bolts
14. Install the under cover.
15. Lower the vehicle.
16. Install the intercooler bracket. see scheme 35: Locating Intercooler Bracket Bolts
17. Install the intercooler. < Ref. to «INSTALLATION»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#intake-induction-h4dotc-engine), Intercooler. >

Scheme 36

1. Disconnect the ground cable from battery.
2. Remove the front oxygen (A/F) sensor. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/fuel-system/#fuel-injection-fuel-systems-h4dotc), Front Oxygen (A/F) Sensor. >
3. Remove the under cover.
4. Remove the exhaust manifold lower cover (RH). see scheme 36: Identifying Exhaust Manifold Lower Cover
5. Remove the nuts which hold the front exhaust manifold to joint pipe. (Scheme 36): Locating Front Exhaust Manifold To Joint Pipe Nut
6. Remove the center exhaust pipe. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/exhaust/#exhaust-h4dotc-engine), Center Exhaust Pipe. >
7. Remove the turbocharger. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#intake-induction-h4dotc-engine), Turbocharger. >
8. Take off the joint pipe in the upward direction.

Install in the reverse order of removal.

Tightening torque

T: 35 N.m (3.6 kgf-m, 26 ft-lb)

Identifying Joint Pipe Installation Position. Scheme 37

Scheme 38

1. Disconnect the ground cable from battery.
2. Lift-up the vehicle.
3. Separate the rear exhaust pipe from center exhaust pipe. NOTE: Be careful, the exhaust pipe is hot. see scheme 39: Identifying Rear Exhaust Pipe From Center Exhaust Pipe
4. Separate the rear exhaust pipe from muffler. CAUTION: Be careful not to pull down the rear exhaust pipe. (Scheme 38): Identifying Rear Exhaust Pipe From Muffler
5. Remove the rear exhaust pipe.

Note. Replace the gaskets and self-locking nut with new ones.

1. Install the rear exhaust pipe to muffler. Tightening torque: 48 N.m (4.9 kgf-m, 35.4 ft-lb) see scheme 41: Locating Rear Exhaust Pipe To Muffler Nut And Bolt
2. Install the rear exhaust pipe to center exhaust pipe. Tightening torque: 18 N.m (1.8 kgf-m, 13 ft-lb) see scheme 42: Identifying Rear Exhaust Pipe To Center Exhaust Pipe
3. Lower the vehicle.
4. Connect the battery ground cable to battery.

INSPECTION

1. Make sure there are no exhaust leaks from connections and welds.
2. Make sure there are no holes or rusting.
3. Make sure the cushion rubber is not worn or cracked.

REMOVAL

1. Separate the muffler from rear exhaust pipe. CAUTION: Be careful, the exhaust pipe is hot. see scheme 43: Locating Muffler From Rear Exhaust Pipe
2. Remove the rubber cushions, and detach the muffler.

Note. To facilitate removal, apply a coat of spray type lubricant to the mating area of rubber cushions in advance.

Locating Rubber Cushions. Scheme 39

Install in the reverse order of removal.

Note. Replace the gasket and self-locking nut with a new one.

Tightening torque

48 N.m (4.9 kgf-m, 35.4 ft-lb)

1. Make sure there are no exhaust leaks from connections and welds.
2. Make sure there are no holes or rusting.
3. Make sure the cushion rubber is not worn or cracked.

See also:
• REMOVAL
• REMOVAL
• REMOVAL