122-B7N6X-03

Installation and Conversion Instructions
911 (991)
3/16
ENU
2601
2
Sports Exhaust System (176)
Information:
Retrofitting
Model Year:
As of 2017 up to 2019
Vehicle type:
911 Carrera S (991)/911 Carrera 4S (991)/911 Targa 4S (991)
Engine Type:
DCHA (3.0 l)
Figure 1
Notes:
The sports exhaust system is activated and deactivated using the switch console with the additional
"Twin tailpipe" button. The sports exhaust system is also activated by pressing the “Sport” and “Sport
Plus” buttons. The sports exhaust system can be switched off separately in these modes using the "Twin
tailpipe" button.
The combined switch (switch console) and tailpipes must also be ordered. The switch console is
modular and must be assembled in accordance with the new vehicle equipment.
Engine power and exhaust behaviour of the vehicle are not affected.
Part
Information:
991.044.200.30
 Sports exhaust system, set
Also order the following:
991.044.200.24
1x
991.613.955.50.DML1 1 x
 Tailpipe, silver, set
 Combined switch (switch console), I-no. 652, Coupé
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911 (991)
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ENU
Installation and Conversion Instructions
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991.613.957.50.DML1 1 x
 Combined switch (switch console), I-no. 653, Coupé
991.613.959.50.DML1
 Combined switch (switch console), I-no. 651, Coupé
1x
991.613.967.50.DML1 1 x
 Combined switch (switch console), I-no. 552, Cabriolet
991.613.963.50.DML1
 Combined switch (switch console), Targa
1
1x
Depending on vehicle equipment
Parts List:
Figure 2
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9P1.254.400.A
1x
Left catalytic converter  Figure 2 -1-
9P1.251.263
2x
Seal  Figure 2 -2-
9P1.251.187.B2
1x
Tailpipe, silver  Figure 2 -3-
9P1.251.188.B2
1x
Tailpipe, silver  Figure 2 -4-
9P1.254.450.A
1x
Right catalytic converter  Figure 2 -5-
9P1.253.145
2x
Clamping sleeve  Figure 2 -6-
997.111.230.80
2x
Clamp  Figure 2 -7-
9P1.251.751
2x
Clamp on main silencer  Figure 2 -8-
999.073.418.01
2x
Tapping screw, ST 4.8 x 19-C  Figure 2 -9-
999.076.091.01
2x
Hexagon nut, M6  Figure 2 -10-
996.505.649.01
1x
Bracket  Figure 2 -11-
9P1.251.053.A
1x
Main silencer  Figure 2 -12-
991.505.811.04OK1
1x
Rear apron (black, grained)  Figure 2 -13-
991.505.651.04OK1
1x
Tailpipe cover (black, grained)  Figure 2 -14-
991.505.639.03
1x
Rear support  Figure 2 -15-
991.505.475.04
1x
Heat shield  Figure 2 -16-
999.507.309.02
4x
Speed nut, ST 4.8 (not shown)
Tequipment
Installation and Conversion Instructions
999.084.642.02
8x
Hexagon nut, M8 (not shown)
911 (991)
3/16
ENU
2601
991.505.837.02
1x
Lower retaining strip, middle (not shown)
991.505.837.03
2x
Lower retaining strip, outer (not shown)
999.190.191.30
3x
Blind rivet, A3.2 x 17 (not shown)
9A7.007.483.003
4x
Torx screw (for securing seat), (not shown)
9P3.974.2803
1x
Wire harness for sports exhaust system (not shown)
999.650.531.003
1x
Cable ring eyelet (not shown)
999.650.566.223
1x
Socket contact (not shown)
991.044.200.153
1x
Cable casing (not shown)
999.073.227.09
1x
Tapping screw, ST 4.8 x 19 (not shown)
N 020.904.43
15 x
Tie-wrap (not shown)
999.073.236.0A
8x
Countersunk screw, M6 x 10 (for securing heat shield for
turbocharger)
2
Figure 3
Parts included for vacuum supply system
9P1.251.838.A
1x
Vacuum line, metal  Figure 3 -1-
900.918.005.40
1x
Plastic tube (5 x 1 x 1,000 mm)  Figure 3 -2-
06E.133.794
3x
T-piece  Figure 3 -3-
999.651.363.01
1x
Cable holder  Figure 2 -4-
999.512.707.00
4x
One-ear hose clamp, 9.6-11.3  Figure 3 -5-
999.651.401.013
4x
Clip (for securing vacuum line, metal)  Figure 3 -6-
9A1.110.666.00
2x
Moulded hose  Figure 3 -7-
999.239.048.40
1x
Connecting hose (4.5 x 2.5 x 28 mm)  Figure 3 -8-
991.111.504.00
1x
190-mm steel flexi-pipe  Figure 3 -9-
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Installation and Conversion Instructions
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Materials:
93-mm steel flexi-pipe  Figure 3 -10-
1x
991.111.502.00
7PP.906.283.F3
1x
Change-over valve  Figure 3 -11-
999.181.518.50
1x
Protective tube, L = 50 mm  Figure 3 -12-
2
Contained in set 991.044.200.24.
3
Not required for installing the sports exhaust system on the S model.
000.043.172.00
1x
Sealing cord
000.043.004.82
1x
Optimol-HT mounting paste
———
Rust solvent, commercially available, e.g. WD40
Identifying features when installed:
In addition to the Porsche logo, a part number is shown on the main silencer, catalytic converters and
tailpipes.
Notes:
The relevant legal regulations must be observed in the various countries.
9900 - PIWIS Tester 3
Tools:
Transmission and Engine Jack
Assembly:
1
Preparatory work:
1.1
Move convertible top to service position.
1.1.1
Cabriolet:  Workshop Manual '6101IN Convertible-top service position
(Cabriolet)'
1.1.2
Targa:  Workshop Manual '6101IN05 Convertible-top service position'
WARNING
Moving components
•
Danger of limbs being trapped or severed

Do not reach into the danger area.

Secure the system to prevent it from being activated accidentally.

Keep third parties away from the danger area.
1.2
2
Remove the following components in the rear area.
2.1
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Extend the rear spoiler manually using the rocker switch in the passenger compartment.
Remove engine-compartment blower.  Workshop Manual '198119 Removing and
installing engine-compartment blower'
Tequipment
Installation and Conversion Instructions
911 (991)
3/16
ENU
2601
2
2.2
Remove air guide.  Workshop Manual '243619 Removing and installing air guide'
2.3
Remove tail lights.  Workshop Manual '943119 Removing and installing tail light'
2.4
Remove rear apron.  Workshop Manual '635519 Removing and installing rear apron'
2.5
Remove bumper together with heat shield.  Workshop Manual '635019 Removing and
installing rear bumper'
2.6
Remove rear spoiler.  Workshop Manual '66581905 Removing and installing rear spoiler'
2.7
Remove air guide on charge-air cooler
 Figure 4 -1, 2-.  Workshop Manual
'211019 Removing and installing air guide for
charge-air cooling'
Figure 4
2.8
Remove pressure pipe  Figure 5 -1-. 
Workshop Manual '214119 Removing and
installing pressure pipe'
Figure 5
2.9
Remove air cleaner housing  Figure 6 -1-.
 Workshop Manual '242519 Removing and
installing air cleaner housing'
Figure 6
CAUTION
Hot components
•
Risk of burns

Let hot components cool down.

Wear personal protective gear.
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911 (991)
2601
ENU
3
Installation and Conversion Instructions
3/16
Remove exhaust system.
3.1
Remove heat shield for turbocharger at the
left  Figure 7 -2- and right.
Figure 7
WARNING
Danger of objects or loads falling down
•
Risk of squashing or crushing

Secure components to prevent them from falling down.
Information
The exhaust system must only be removed with the help of another person.
3.2
4
Remove exhaust system.  Workshop Manual '260119 Removing and installing exhaust
system'
Install vacuum line.
4.1
Remove standard vacuum line from the clips
 Figure 8 -2- on the engine carrier  Figure
8 -1-.
4.2
Assemble vacuum line.
4.2.1
Cut off 3 sections (length: 25 mm,
70 mm, 350 mm) of plastic tube
(900.918.005.40).
Figure 8
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Tequipment
Installation and Conversion Instructions
4.2.2
3/16
ENU
2601
2
Connect components together as
shown in Figure 9.
1
2
3
4
5
6
7
8
9
–
–
–
–
–
–
–
–
–
190-mm steel flexi-pipe
One-ear hose clamp
Plastic tube (25 mm)
Moulded hose
Plastic tube (70 mm)
Protective tube (50 mm)
T-piece
Plastic tube (350 mm)
Moulded hose
Press one-ear hose clamp  Figure
9 -2- together.
4.2.3
911 (991)
Figure 9
Insert metal vacuum line
(9P1.251.838.A)  Figure 10 -3as far as the marking (white) 
Figure 10 -arrow a- into the T-piece
 Figure 10 -4-.
Insert metal vacuum line as far as
the marking (white)  Figure 10
-arrow a- into the 93-mm steel
flexi-pipe  Figure 10 -1-.
Press one-ear hose clamp  Figure
10 -2- together.
4.3
Figure 10
Install assembled vacuum line  Figure 11
-1- into the standard clips  Figure 11 -2- on
the engine carrier.
Figure 11
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911 (991)
2601
ENU
4.4
5
3/16
Installation and Conversion Instructions
Clip steel flexi-pipe  Figure 12 -2- into cable
holder  Figure 12 -1-.
Install sports exhaust system.
Figure 12
5.1
Install right catalytic converter  Figure 13
-1- with a new seal on the turbocharger 
Figure 13 -3- and secure with a new hexagon
nut  Figure 13 -2- to prevent it from falling
down.
Information
The oxygen sensors can only be screwed by
4 – 5 turns without disconnecting the electric
plug connections.
Figure 13
Information
•
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When re-installing oxygen sensors, only grease the thread with lubricant.
Tequipment
Installation and Conversion Instructions
•
5.2
911 (991)
3/16
ENU
2601
2
New oxygen sensors have already been greased and the thread is installed with a
protection cap.
Install oxygen sensors upstream of catalytic
converter  Figure 14 -1- and downstream
of catalytic converter  Figure 14 -2- on the
right catalytic converter.
Tightening torque 50 Nm (37 ftlb.)
+/-8 Nm (+/-6 ftlb.)
5.3
Install left catalytic converter with a new seal
on the turbocharger and secure with a new
hexagon nut to prevent it from falling down.
Information
The oxygen sensors can only be screwed by
4 – 5 turns without disconnecting the electric
plug connections.
5.4
Install oxygen sensor upstream and
downstream of catalytic converter on the left
catalytic converter.
Tightening torque 50 Nm (37 ftlb.) +/-8 Nm (+/-6 ftlb.)
5.5
Install clamping sleeve at the left  Figure 15
-1- and right on the catalytic converters.
Figure 14
Install clamps  Figure 15 -2- on the main
silencer.
Figure 15
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ENU
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Installation and Conversion Instructions
Information
•
5.6
Apply a light coating of high-temperature grease (e.g. Optimoly HT, Part No.
000.043.004.00) on the clamp or pipe adapter before installation.
Guide main silencer  Figure 16 -1- into the
catalytic converter at the left and right with
the help of another person  Figure 16 -a-.
Slide clamping sleeves  Figure 16 -2- over
the pipe adapters.
Figure 16
5.7
Install restraining straps  Figure 17 -1-.
Figure 17
5.8
Slide vacuum line at the left and right 
Figure 18 -1- onto the exhaust flap control
box and press one-ear hose clamp  Figure
18 -2- together.
Figure 18
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Tequipment
Installation and Conversion Instructions
5.9
911 (991)
3/16
ENU
2601
2
Position main silencer with lock  Figure 19
-1- on the main silencer holder  Figure 19
-2- ( Figure 20 -arrow-).
Tighten restraining straps.
Tightening torque 15 Nm (11 ftlb.) +/-10
%
Figure 19
5.10
Install and tighten the remaining hexagon
nuts  Figure 20 -1- securing the catalytic
converters to the turbocharger.
Tightening torque 25 Nm (19 ftlb.) +/-10
%
Figure 20
Figure 21
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ENU
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Installation and Conversion Instructions
Information
It is important to ensure that the clamps
and pipe joiners are tightened in horizontal
position.
Clamps must be horizontal when tightened
5.11
Tighten clamping sleeves  Figure 22 -4and clamps  Figure 22 -1-.
5.11.1
Tighten clamping sleeves.
Tightening torque 30 Nm
(22 ftlb.)
5.11.2
Tighten clamps.
Tightening torque 55 Nm
(41 ftlb.) +/-10 %
Figure 22
5.12
6
Install heat shield for turbocharger at the left
 Figure 23 -2- and right.
Convert heat shield on bumper.
6.1
Remove standard heat shield from rear
bumper.
Figure 23
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Tequipment
Installation and Conversion Instructions
6.1.1
911 (991)
3/16
ENU
2601
2
Unscrew tapping screw  Figure
24 -1- and remove bracket 
Figure 24 -2-.
Figure 24
6.2
6.1.2
Unscrew hexagon nuts  Figure 25
-1- and remove rear supports 
Figure 25 -2-.
6.1.3
Disconnect heat shield and rear
bumper.
Assemble new heat shield and bumper.
Figure 25
6.2.1
Position rear support  Figure 26
-1- on the heat shield. Screw on
and tighten hexagon nuts  Figure
26 -2-.
Tightening torque 9.7 Nm
(7.5 ftlb.)
Figure 26
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911 (991)
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ENU
6.2.2
7
Installation and Conversion Instructions
3/16
Position fastening bracket  Figure
27 -1- and screw in and tighten
tapping screw  Figure 27 -2-.
Tightening torque 2.8 Nm
(2 ftlb.)
Convert rear apron.
Figure 27
7.1
Remove rear skirt.  Workshop Manual
'636819 Removing and installing rear skirt'
7.2
Make cut-out for new rear skirt.
7.2.1
Mark rear apron.
Figure 28
Figure 29
1
X
Y
Feb 28, 2020
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– Bar
– Distance from bar: 5 mm
– Dimension = 16 mm
Tequipment
Installation and Conversion Instructions
Z
7.2.2
911 (991)
3/16
ENU
2601
2
– Distance from edge of hole: 5 mm
Saw along the marking using a body
saw.
Re-work cut edges if necessary.
Figure 30
7.3
Clip tailpipe cover  Figure 31 -1- into the
rear skirt  Figure 31 -2-.
Figure 31
7.4
Clip rear skirt  Figure 32 -1- into the rear
apron  Figure 32 -2-.
Screw in and tighten screws  Figure 32 -3-.
Figure 32
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911 (991)
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ENU
7.5
8
Installation and Conversion Instructions
3/16
Secure center retaining strip  Figure 33
-2- and two retaining strips at the outside 
Figure 33 -1- to the rear apron using rivets.
Concluding work:
8.1
Install the air cleaner housing.  Workshop
Manual '242519 Removing and installing the
air cleaner housing'
8.2
Install pressure pipe.  Workshop Manual
'214119 Removing and installing pressure
pipe'
8.3
Install air guide for charge-air cooler  Figure
34 -1, 2-.
8.4
Install rear spoiler.  Workshop Manual
'66581905 Removing and installing rear
spoiler'
8.5
Install engine-compartment blower. 
Workshop Manual '198119 Removing and
installing engine-compartment blower'
8.6
Figure 33
Figure 34
Install bumper.
8.6.1
Unscrew screws  Figure 35 -1on the heat shield.
8.6.2
Install bumper together with heat
shield.  Workshop Manual
'635019 Removing and installing
rear bumper'
Figure 35
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Tequipment
Installation and Conversion Instructions
8.6.3
911 (991)
3/16
ENU
2601
2
Tighten screws  Figure 36 -1- on
the heat shield.
Figure 36
8.7
Install rear apron.  Workshop Manual
'635519 Removing and installing rear apron'
Secure rear apron in the center using a new
tapping screw (999.073.227.09  Figure
37 -1-.
8.8
Install bumper.
Figure 37
8.8.1
Unscrew screws  Figure 38 -1on the heat shield.
8.8.2
Install bumper together with heat
shield.  Workshop Manual
'635019 Removing and installing
rear bumper'
Figure 38
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ENU
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8.8.3
Installation and Conversion Instructions
Tighten screws  Figure 39 -1- on
the heat shield.
8.9
Install rear apron.  Workshop Manual
'635519 Removing and installing rear apron'
8.10
Install tailpipes.  Workshop Manual
'263519 Removing and installing tailpipe
cover'
8.11
Install tail lights.  Workshop Manual
'943119 Removing and installing tail light'
Figure 39
WARNING
Moving components
•
Danger of limbs being trapped or severed

Do not reach into the danger area.

Secure the system to prevent it from being activated accidentally.

Keep third parties away from the danger area.
8.12
Retract the rear spoiler manually using the rocker switch in the passenger compartment.
8.13
Convert switch console.
8.13.1
Remove switch console.  Workshop Manual '962719 Removing and installing
switch console'
Information
The switch console consists of a total of 16 buttons, 10 light guides and 10 trims.
Each half can be used for the left or right row of the main body.
8.13.2
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Assemble new switch console in accordance with the new vehicle equipment.
Tequipment
Installation and Conversion Instructions
911 (991)
3/16
ENU
2601
2
Install light guide at the correct side
 Figure 40 -1- in the main body 
Figure 40 -arrow-.
Figure 40
Install trim  Figure 41 -1underneath the button in the main
body  Figure 41 -arrows-.
Figure 41
Position button  Figure 42 -1- and
clip it into the main body  Figure
42 -arrow-.
8.13.3
Install switch console.  Workshop
Manual '962719 Removing and
installing switch console'
Figure 42
NOTICE
Voltage drop
•
Risk of irreparable damage to control unit
•
Risk of damage to control unit
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Installation and Conversion Instructions
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•
Fault entries in the control unit
•
Coding in the control unit is aborted
•
Malfunctions in control unit, even during programming

Switch off the ignition and remove the ignition key before disconnecting the control unit.

Ensure that the power supply is not interrupted during programming.

Connect a battery charger with a current rating of at least Nominal value 90 A to the vehicle battery.
Information
The 9900 - PIWIS Tester III instructions take precedence since the description may be different
with later Tester releases.
The procedure described here has been structured in general terms; different text or additions may
appear on the 9900 - PIWIS Tester III.
9
Code the sports exhaust system.
9.1
9900 - PIWIS Tester 3 must be connected before switching on the ignition.
9.2
Select the required vehicle type. PIWIS Tester Diagnostics starts.
Information
The sport exhaust system button can only be coded on the right-hand side of the switch
console.
Feb 28, 2020
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9.3
Code keypad assignment.  Workshop Manual '962755 Replacing switch console'
9.4
Maintenance of vehicle data
9.4.1
Select Additional menu by pressing •F7“.
9.4.2
Select the "Maintenance of vehicle data" function. Press •F12“ until "M numbers"
appears in the Value group column.
9.4.3
Select "176 - Sports exhaust system" in the Coding value column. When you touch
the "Installed" cell, a tick appears.
9.4.4
Save the values with •F8“. Wait until the message "Modified values have been
buffered" appears.
9.4.5
Press •F12“ until •F8“ can be activated.
9.4.6
Press •F8“ to write values. Wait until the message "Generation of vehicle data is
complete" appears.
9.4.7
Press •F12“ to switch to Report management. Open the log by pressing •F10“
and check that vehicle equipment "176 Sports exhaust system" is displayed.
Tequipment
Installation and Conversion Instructions
9.5
911 (991)
3/16
ENU
2601
2
Adapt coding.
9.5.1
Press •F11“ to return to the list of control units.
Select all control units.
9.5.2
Switch to the "Codings/adaptations" menu.
Select "Automatic coding" mode. Press •F12“ to continue.
Wait until the message "Coding was completed successfully" appears. Press
•F12“ to continue.
9.6
Read out the fault memories of all systems, work through any existing faults and erase the
fault memories.  Workshop Manual '033500 Fault memory for on-board diagnosis'
9.7
Switch off ignition and disconnect 9900 - PIWIS Tester 3.
9.8
Carry out a function test on the “sports exhaust system”.
The exhaust flaps open when you press the "Twin tailpipe" button. The noise of the exhaust
motor can be heard.
9.9
26 01 31 00:
Disconnect battery charger. (  Workshop Manual '2X00IN Battery trickle charging').
–Installing sports exhaust system–
Includes:
Removing and installing exhaust system, rear skirt and switch
console; replacing catalytic converters and main silencer;
coding sports exhaust system and strip for switches.
Labor time: 487 TU
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.
© 2020 Porsche Cars North America, Inc.
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