Hoses / Pipes / Sleeves

To Fit:
Porsche 911 (930 Turbo) 1978 to 1989 all models with 3.3L Turbo engine
Hoses included:
• Air injection pump / Diverter valve - OEM ref 93011311801
• Diverter valve / Exhuast air tube - OEM ref 93011318100
• Diverter valve / Atmosphere - OEM ref 93011318200
Please refer to the product images for confirmation of position of the hoses.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
DO88-KIT143S
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)

To Fit:
For Hose Kit #DO88-KIT143S
Porsche 911 (930 Turbo) 1978 to 1989 all models with 3.3L Turbo engine
Kit of 6 clamps:
The kit contains all necessary hose clamps to install the specified hose kit. The included clamps are a high quality standard design type in all stainless steel (W4 class) with a stamped band to minimize impact on hose surface.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CLAMP-KIT143
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)


Fits:
Porsche 911 TURBO 1978-89
Porsche 964 TURBO 1991-94
Click 'Zoom in' for large parts diagram.
Diagram ref no 15
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93011304302
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fits:
Porsche 911 TURBO 1978-89
Porsche 964 TURBO 1991-94
Diagram ref no 15
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93011304302
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93

18 x 26 x 180
Fits:
Porsche 930 (911) Turbo 3.3L 1983-89
Diagram ref no 53
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG239094A
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)

7.3 x 3

Fits:
Porsche 930 (911) Turbo 3.3L 1983-89
Click 'Zoom in' for large parts diagram.
Diagram ref no 26
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99923903440
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)

To Fit:
For K Jetronic Hose Kit #DO88-KIT142S
Porsche 911 (930 Turbo) 1978 to 1989 all models with 3.3L Turbo engine
Kit of 12 clamps
The kit contains all necessary hose clamps to install the specified hose kit. The included clamps are a high quality standard design type in all stainless steel (W4 class) with a stamped band to minimize impact on hose surface.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CLAMP-KIT142
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)

To Fit:
Porsche 911 (930 Turbo) 1978 to 1989 all models with 3.3L Turbo engine
Hoses included:
• Y-connection on lower intake manifold / Valve on upper intake manifold - OEM ref 99918128450
• Vacuum limiter / Upper intake manifold - OEM ref 93011017101
• Vacuum limiter / Y-connection on lower intake manifold - OEM ref 99923900740
• Connection on lower intake manifold / Brake vacuum - OEM ref 99923901140
• Auxiliary air regulator / Throttle body - OEM ref 93011033500 / 93011033503
• Auxiliary air regulator / Air filter box - OEM ref 99923900940
Please refer to the product images for confirmation of position of the hoses.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
DO88-KIT142S
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)

To Fit:
For Turbo inlet hose kit #DO88-KIT145S
Porsche 911 (930 Turbo) 1978-1989 with 3.3 Litre Turbo engine
Kit of 6 clamps
The kit contains all necessary hose clamps to install the specified hose kit. The included clamps are a high quality standard design type in all stainless steel (W4 class) with a stamped band to minimize impact on hose surface.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CLAMP-KIT145
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Made from high quality silicone rubber with 3 layer polyester reinforcement.

To Fit:
Porsche 911 (930 Turbo) 1978-1989 with 3.3 Litre Turbo engine
Hoses included:
• Wastegate hose, OEM ref 99923903440
• Warm-up valve / Air filter box, OEM ref 99923900640 / 99923903440
• Warm-up valve / T-connection on throttle body, OEM ref 99923901340
• T-connection on throttle body / Vacuum limiter, OEM ref 99923901340
Please refer to the product images for confirmation of position of the hose.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
DO88-KIT144S
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95

To Fit:
For Turbo vacuum hose kit #DO88-KIT144S
Porsche 911 (930 Turbo) 1978-1989 with 3.3 Litre Turbo engine
Kit of 8 clamps
The kit contains all necessary hose clamps to install the specified hose kit. The included clamps are a high quality standard design type in all stainless steel (W4 class) with a stamped band to minimize impact on hose surface.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CLAMP-KIT144
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Air Inlet Hoses, Pipes & Sleeves – Durable Intake Components for Porsche Performance
Air inlet hoses, pipes, and sleeves are essential components of your Porsche’s intake system, connecting the air filter housing, throttle body, turbocharger, and intercooler. They ensure a smooth and sealed flow of air into the engine, supporting efficient combustion, responsive acceleration, and consistent performance.
At Design911, we supply a full range of genuine and high-quality air inlet hoses, pipes, and sleeves for numerous Porsche models that include 911, Boxster, Cayman, Cayenne, Macan, and Panamera models. Each component is engineered for precision fitment, heat resistance, and airflow stability — helping your Porsche deliver the performance and reliability it’s known for.
What Do Air Inlet Hoses, Pipes & Sleeves Do?
These components channel filtered air through the intake
system to the engine’s combustion chambers. Their main functions include:
- Maintaining
airtight airflow between intake components.
- Reducing
turbulence and air loss for improved throttle response.
- Supporting
optimal air pressure for turbocharged and naturally aspirated engines.
- Protecting against contaminants that can reduce performance or cause engine wear.
In turbocharged Porsche models, these parts also help manage boost pressure, making them crucial to both efficiency and power delivery.
Why Do Air Inlet Hoses, Pipes & Sleeves Fail?
Due to their constant exposure to heat, vibration, and
engine movement, air inlet components can deteriorate over time. Common causes
of failure include:
- Cracking
or splitting from heat cycles and material fatigue.
- Oil
or fuel vapor contamination softening the rubber or plastic.
- Loose
or damaged clamps causing vacuum or boost leaks.
- Age-related
hardening leading to brittle connections.
- Excessive boost pressure stressing the hose in performance applications.
Symptoms of failure include hissing or whistling noises, loss of boost pressure, poor throttle response, rough idling, or a check engine light caused by airflow irregularities.
Why Replace Worn Air Inlet Components?
A leaking or damaged inlet hose can cause unmetered air to enter the engine, resulting in incorrect fuel-air ratios, poor performance, or even turbocharger strain. Replacing worn or cracked hoses and pipes ensures proper airflow, efficient combustion, and reliable performance.
Benefits of replacement include:
- Restored air pressure and engine response.
- Improved turbo efficiency and power delivery.
- Enhanced fuel economy and reduced emissions.
- Long-term reliability with manufacturer-quality materials.
All hoses, pipes, and sleeves available at Design911 are crafted from high-temperature silicone, reinforced rubber, or aluminium alloys for superior sealing, flexibility, and strength — ensuring dependable performance under demanding conditions.