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Breather Pipes
By OE Match
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97

Fits:
Porsche 993 Carrera 2 / Carrera 4 >>1995
Engine type: 6405 / 6406 / 6407 / 6408
Click 'Zoom in' for large parts diagram.
Diagram ref no 37
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320715082
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
Fits:
Porsche 993 C2 / C4 - 1994 to 1998
Diagram ref no 54
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320715104
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97

Fits:
Porsche 993 C2 / C4 / RS 1994 to 1998
Porsche 993 turbo - 1994 to 1998
Click 'Zoom in' for large parts diagram.
Diagram ref no 29
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320714601
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
Fits:
Porsche 993 C2 / C4 / RS 1995-98
Diagram ref no 54
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320715102
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
Fits:
Porsche 993 C2 / C4 3.6L 1994-95
Diagram ref no 52.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320714301
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
Fits:
Porsche 993 C2 / C4 3.6L 1996-98
Porsche 993 Carrera RS 3.75L 1995-96
Diagram Ref No 52.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320714303
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
The 99320714903 is a vent or breather hose - also referred to as an oil tank breather hose or crankcase vent hose - specifically designed for Porsche 911 “993” models. Its primary role is to equalize pressure within the oil tank and crankcase by safely channeling oil vapors and gases. This prevents excessive pressure that could cause oil leaks, foaming, or oil being forced past seals and gaskets, while also helping manage emissions by directing vapors correctly.
Fits:
Porsche 993 Carrera 2 / Carrera 4 1994 - 1997
Porsche 993 Carrera S / Carrera 4S 1994 - 1997
Porsche 993 turbo / GT2 1994 - 1997
Diagram ref no 33
Replacing this hose matters for several reasons:
• If the hose ages, cracks, gets brittle, or is blocked, it can’t vent properly. This may lead to pressure build-up in the oil tank/crankcase
• A faulty hose can cause oil leaks through seals or gaskets, or force oil out of vent points
• It can lead to poor engine performance or oil foaming, which in turn risks oil starvation or damage, especially under heavy load or high temperature
• Emissions issues may result: the engine may throw codes, or oil vapors may be vented where they shouldn’t, failing emission checks
• For older cars, these hoses degrade over time (rubber/hoses hardened by heat, oil exposure); preventative replacement helps avoid breakdowns.
This part often supersedes earlier versions (99320714901 and 99320714902), making it the updated replacement in many cases.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320714903
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97

Fits:
Porsche 993 Carrera 2 - 1996 onwards
Carrera RS - 1996 onwards
Click 'Zoom in' for large parts diagram.
Diagram ref no 37
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320715002
The product you are viewing cross references to these numbers
OEMatch Breather Pipes — Fit, Function, Confidence
Breather pipes and crankcase ventilation parts for Porsche models manage oil vapour and internal pressure to protect lubrication and reduce leaks. OEMatch offers a focused selection of hoses, separators and seals suited to Porsche applications, covering routine maintenance and rebuild requirements.
Available Types
- Flexible breather hoses and oil vapour pipes
- Oil separator and catch can assemblies
- Crankcase vent hoses and connecting pipes
- Grommets, seals and mounting fittings
Understanding OEMatch Breather Pipes
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original breather pipes.
OE (Original Equipment) refers to parts matching original specifications for the breather pipes and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM breather pipes engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Breather pipes route crankcase vapour and blow-by gases away from the engine, helping to separate oil from vapour and return condensate to the sump or collection points. Correct ventilation reduces contamination, prevents pressure build-up and supports stable idling and consistent oil return across Porsche engines.
Benefits Include
- Restores correct crankcase ventilation and pressure control
- Helps reduce oil leaks and visible smoke
- Limits oil contamination and sludge formation
- Supports stable idling and efficient oil return
Why Breather Pipes Wear and Fail
- Heat-related hardening, cracking or brittleness of rubber and plastic hoses
- Oil and carbon build-up causing blockages or restricted flow
- Degraded or collapsed internal liners and collapsed passages
- Loose, hardened or damaged grommets and sealing fittings
The Importance of Replacing with OEMatch Breather Pipes
Keeping breather pipes in good condition prevents oil loss and contamination that can accelerate wear in Porsche engines. Replacing degraded hoses and seals reduces the risk of pressure-related faults and leaks, helping maintain reliable lubrication, consistent idling and longer component life when combined with regular oil and filter care.
Advantages
- Manufactured for oil and heat resistance appropriate to engine conditions
- Produced to original-spec dimensions for consistent performance
- Suitable for air-cooled and water-cooled Porsche engine layouts