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- Porsche 911 1978-1989 3.3L Turbo (930)
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Related, superseded, cross reference or alternative numbers for comparison.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
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Vacuum Hose - 3.5 x 2mm
High-quality vacuum hose with 3.5 x 2mm dimensions, designed for Porsche 964, 996, 986 Boxster, and 987.1 Boxster & Cayman models.
This hose is used across various engine systems to maintain
proper vacuum pressure, supporting the operation of intake, fuel, and
emissions-related components. It is essential for ensuring smooth engine
performance and correct system functionality.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Diagram ref no 21
Supplied in 1 metre lengths, this hose allows precise
replacement and routing, making it ideal for maintenance, repair, or
restoration of Porsche vacuum systems. Manufactured to OEM standards for
durability and reliability.
Key Features
• 3.5mm internal diameter, 2mm wall thickness
• Suitable for Porsche 964, 996, 986, and 987.1 models
• Part number 00004320499
• Designed for vacuum system applications
• Supplied in 1 metre lengths
• Flexible and durable construction
• Resistant to heat and engine bay conditions
• OEM-style fit and performance
Function and Purpose
This vacuum hose is a critical part of engine system operation.
It helps to:
• Maintain vacuum pressure across engine systems
• Support intake and fuel system functions
• Enable proper operation of valves and regulators
• Ensure balanced airflow and engine efficiency
• Support emissions control systems
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
00004320499
The product you are viewing cross references to these numbers