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Porsche > 911 & 912 (1965-1989) > 911 1978-1989 3.3L Turbo (930) > Engine Rebuild Parts > Air Intake & Injection >

Hoses / Pipes / Sleeves

Hoses / Pipes / Sleeves

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DISPLAYING 17 to 25 (of 25 products)
1 2
Hose Warm-up valve to Air filter box. Porsche 930 1983-89 - 99923903440, 99923900640 - PKS733
2
Hose Warm-up valve to Air filter box. Porsche 930 1983-89
99923903440/1
Product Information
Product Information

Hose – Warm-Up Valve to Air Filter 
Sold per metre

High-quality hose designed for Porsche 911 turbo (930) models from 1983 to 1989, connecting the warm-up valve (warm-up regulator) to the air filter box.

Fits:

  • Porsche 911 1978-1989 3.3L Turbo (930

Diagram ref no 26

This hose plays a key role in the Bosch CIS (Continuous Injection System), supporting proper airflow and pressure regulation between the warm-up valve and intake system. It is essential for maintaining correct engine warm-up characteristics and stable fuel delivery.

Sold per metre, this hose allows for custom length replacement, making it ideal for maintenance, repair, or restoration of classic Porsche 911 Turbo fuel and intake systems. Manufactured to OEM specifications for reliable fitment and performance.

Key Features

• Hose for warm-up valve to air filter box connection
• Suitable for Porsche 911 Turbo (1983–1989)
• Part number 99923903440
• Designed for CIS fuel injection systems
• Sold per metre for custom length applications
• Flexible and durable construction
• OEM-style fit and performance

Function and Purpose

This hose is an important part of the CIS system.

It helps to:
• Connect the warm-up valve to the air intake system
• Maintain correct air and pressure balance
• Support proper engine warm-up operation
• Ensure consistent fuel delivery
• Enable stable engine performance

Why Replace Hoses

Over time, hoses can degrade due to heat and engine bay conditions.

Common issues include:
• Cracking or splitting
• Air leaks affecting engine performance
• Hardening and loss of flexibility
• Reduced efficiency of the CIS system

Replacing worn hoses ensures correct system operation and engine reliability.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99923903440
99923903440
99923900640

The product you are viewing cross references to these numbers
Hose. Auxiliary air regulator to air filter box. Porsche 930 3.3L 83-89 - 99923900940, PCG239094A
2
Hose. Auxiliary air regulator to air filter box. Porsche 930 3.3L 83-89
Special Order item
PCG239094A
Product Information
Product Information
Hose. Auxiliary air regulator to air filter box.
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
99923900940
PCG239094A

The product you are viewing cross references to these numbers
Hose. Warm-up valve to Air filter box. Porsche 930 1983-89 - 99923903440, 99923900640
2
Hose. Warm-up valve to Air filter box. Porsche 930 1983-89
Special Order item
99923903440
Product Information
Product Information
Hose. Warm-up valve to Air filter box. (shorten to 120 mm).
7.3 x 3

Fits:
Porsche 930 (911) Turbo 3.3L 1983-89

Diagram ref no 26

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99923903440
99923903440
99923900640

The product you are viewing cross references to these numbers
Inlet Manifold Hose 15x3.5mm. Porsche 911 turbo 1975-89 - 99918128450 - PSDO15-300
2
Inlet Manifold Hose 15x3.5mm. Porsche 911 turbo 1975-89
99918128450/1
Product Information
Product Information

Inlet Manifold Hose - 15 x 3.5mm 

High-quality 15x3.5mm inlet manifold hose designed for Porsche 911 Turbo models, supporting correct airflow within the intake system.

Fits:

  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 911 1978-1989 3.3L Turbo (930)

Diagram ref no 37

This hose connects key intake components, ensuring proper air delivery to the engine and maintaining the balance required for optimal turbocharged performance. Designed to withstand engine bay heat and pressure, it plays a critical role in maintaining stable engine operation and efficiency.

Manufactured to OEM specifications, this hose ensures precise fitment, durability, and reliable performance, making it ideal for maintenance, repair, or restoration of Porsche 911 Turbo intake systems.

Key Features

• 15x3.5mm inlet manifold hose
• Suitable for Porsche 911 Turbo models
• Part number 99918128450
• Designed for air intake system applications
• Ensures secure and leak-free airflow
• Resistant to heat and engine bay conditions
• OEM-style fit and performance

Function and Purpose

This inlet manifold hose is an important part of the intake system.

It helps to:
• Deliver air efficiently to the engine
• Maintain correct air pressure within the intake system
• Support turbocharger and engine performance
• Prevent air leaks that affect running conditions
• Ensure stable and efficient combustion

Why Replace Intake Hoses

Over time, intake hoses can degrade due to heat and pressure.

Common issues include:
• Cracking or splitting
• Air leaks affecting engine performance
• Hardening and loss of flexibility
• Reduced intake efficiency

Replacing worn hoses restores proper airflow and engine performance.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99918128450
99918128450

The product you are viewing cross references to these numbers
K Jetronic hoses clamp kit. Porsche 930 Turbo 1978-89 - 99918128450, 93011017101, 99923900740, 99923901140, 93011033503, 93011033500, 99923900940, PCG239094A - DO88, DO88
1
K Jetronic hoses clamp kit. Porsche 930 Turbo 1978-89
CLAMP-KIT142
Product Information
Product Information
Stainless steel clamp kit for K Jetronic hoses.

doeighteight

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
99918128450
93011017101
99923900740
99923901140
93011033503
93011033500
99923900940
PCG239094A

The product you are viewing cross references to these numbers
K-Jetronic hose kit. Porsche 930 Turbo 1978-89 - 99918128450, 93011017101, 99923900740, 99923901140, 93011033503, 93011033500, 99923900940, PCG239094A - DO88
3
K-Jetronic hose kit. Porsche 930 Turbo 1978-89
DO88-KIT142S
Product Information
Product Information
Silicone K-Jetronic hose kit. Made from high quality silicone rubber with 3 layer polyester reinforcement.

doeighteight

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
99918128450
93011017101
99923900740
99923901140
93011033503
93011033500
99923900940
PCG239094A

The product you are viewing cross references to these numbers
Turbo inlet hoses clamp kit. Porsche 930 Turbo 1978-1989 - 93011013702, 93011015801, 93011015801 - DO88
1
Turbo inlet hoses clamp kit. Porsche 930 Turbo 1978-1989
CLAMP-KIT145
Product Information
Product Information
Stainless steel clamp kit for Turbo inlet hose kit

doeighteight

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
93011013702
93011015801
93011015801

The product you are viewing cross references to these numbers
Turbo vacuum hose kit. Porsche 930 Turbo 1978-1989 - 99923903440, 99923903440, 99923900640, 99923901340, 99923901340 - DO88
4
Turbo vacuum hose kit. Porsche 930 Turbo 1978-1989
DO88-KIT144S
Product Information
Product Information
Silicone turbo vacuum hose kit.
Made from high quality silicone rubber with 3 layer polyester reinforcement.

doeighteight

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
99923903440
99923903440
99923900640
99923901340
99923901340

The product you are viewing cross references to these numbers
Turbo vacuum hoses clamp kit. Porsche 930 Turbo 1978-1989 - 99923903440, 99923903440, 99923900640, 99923901340, 99923901340 - DO88
1
Turbo vacuum hoses clamp kit. Porsche 930 Turbo 1978-1989
CLAMP-KIT144
Product Information
Product Information
Turbo vacuum hoses clamp kit.

doeighteight

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
99923903440
99923903440
99923900640
99923901340
99923901340

The product you are viewing cross references to these numbers
DISPLAYING 17 to 25 (of 25 products)
1 2
Also found on these pages
About Hoses / Pipes / Sleeves

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.

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