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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Vent Line Muffler (Silencer) for Auxiliary Heating
Maintain the correct operation and refinement of your
classic Porsche heating system with this OE Match Vent Line Muffler
(Silencer) for the auxiliary heating system. Designed to replace the
original component fitted to early air-cooled Porsche 911 models, this
precision-manufactured part helps reduce airflow noise within the heater
ventilation circuit while ensuring efficient operation of the auxiliary heating
system.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Diagram ref no 40
Manufactured to OE specifications, this vent line muffler provides accurate fitment and dependable performance, making it an ideal choice during restoration, heater system refurbishment or preventative maintenance. As many original components have now become brittle, corroded or damaged after decades of service, replacing this often-overlooked part helps restore the smooth and quiet operation of the heating and ventilation system.
Whether you're carrying out a concours restoration or simply refreshing your Porsche's heating system, this OE Match component delivers the quality and fit expected for classic air-cooled models.
What Does the Auxiliary Heating Vent Line Muffler Do?
The vent line muffler forms part of the auxiliary heating and ventilation system.
Its purpose is to:
- Reduce airflow and induction noise within the heating system.
- Smooth airflow through the vent line.
- Help maintain efficient heater operation.
- Reduce unwanted resonance from the ventilation circuit.
- Contribute to a quieter and more refined cabin environment.
- Support the correct functioning of the auxiliary heating system.
Although compact, this component plays an important role in maintaining the original characteristics of the Porsche heating system.
Why Replace the Vent Line Muffler?
Years of exposure to heat, moisture, vibration and engine bay contaminants can cause the original vent line muffler to deteriorate.
Common reasons for replacement include:
- Corrosion.
- Internal deterioration.
- Physical damage.
- Blockages restricting airflow.
- Age-related wear.
- Heater system refurbishment.
- Restoration projects.
- Missing original components.
Replacing worn heating components helps restore correct airflow while maintaining the efficiency and refinement of the ventilation system.
Symptoms of a Worn or Damaged Vent Line Muffler
Signs that the component may require replacement include:
- Increased airflow or induction noise from the heating system.
- Reduced heater efficiency.
- Restricted airflow.
- Rattling or vibration within the vent line.
- Visible corrosion or damage.
- Missing heater system components.
- Poor overall heating system performance.
Replacing the vent line muffler helps restore proper airflow characteristics and contributes to quieter heater operation.
Benefits
- Restores quieter heater operation.
- Helps maintain correct airflow.
- Supports efficient auxiliary heating performance.
- Replaces worn or corroded original components.
- Improves overall refinement.
- Easy direct-fit installation.
- Long-lasting durability.
Why Choose OE Match Heating Components?
OE Match heating and ventilation components are manufactured to provide factory-quality fitment, dependable performance and long service life for classic Porsche models. Designed using high-quality materials and precision manufacturing processes, this vent line muffler restores the original operation of the auxiliary heating system while preserving the authentic character of your air-cooled Porsche. It is an excellent choice for restoration specialists and enthusiasts looking to maintain both comfort and originality.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90157206130
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- 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
The Porsche part is ugly roto-formed cheap plastic with parting lines whereas accurate replica is carbon fiber.
Saves 8 to 9lbs about 4Kg from the rear of all 964's and 993's. Will not work on C2 Turbos/965 cars.
Replaces blower motor assembly and ductwork and still allows plenty of heat just like the factory RS part.
Ultra cool clear coated real carbon fiber tube that really cleans up engine bay and makes working on engine easy.
Please Note:
All late model 993's 1996-98 (Varioram engines) require the 964 early type fan air guide shroud (as shown on exploded image)
Can be added below
Due to manufacturing tolerances and the nature of composite materials, minor trimming of excess material may be required during installation to ensure optimal fitment.
Fits:
Porsche 964 C2/C4 1989-1994
Porsche 993 C2/C4 1994-1997
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
964167003
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fits:
Porsche 964 1989-94 all models
Diagram ref no 4
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99951255300
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- 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 964 / 993 1989 - 1998 EXCEPT 95's*.
993's require the 964 fan shroud part # 964.106.403.02 .
Many people are using these on 95's but fitment at the base is poor, and we do not recommend installation on this model year.
Rennline’s blower motor bypass pipe is a carbon fiber replica of the factory installed unit found on the lightweight 3.6 RS race cars. This pipe allows you to save 9 pounds from the removal of the factory blower motor assembly, but still have a functioning heater system in your car. Manufactured from ultra strong, lightweight carbon fiber and comes equipped with the aluminium fitting for the distributor breather tube.
Note: Pictures may not show actual product.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
M09NOPLATE
The product you are viewing cross references to these numbers