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Inlet Manifold
By OE Match
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 993 C2 / C4 1994-98
Porsche 993 Turbo
Click 'Zoom in' for large parts diagram.
Diagram ref no 9 & 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311071250
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 993 C2 / C4 1994-98
Porsche 993 Turbo
Click 'Zoom in' for large parts diagram.
Diagram ref no 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311071250
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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
- 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
Fits:
Porsche 964 1989-94
Porsche 993 1995-98
This product supersedes Porsche's old part numbers:
- 96411071300
- 96411071301
Click 'Zoom in' for large parts diagram.
Diagram ref no 13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311071301
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
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
OE Match intake manifold rubber sleeve for Porsche 964 and 993 models. This replacement rubber coupling forms part of the engine air intake system, helping provide a secure and sealed connection between intake components for correct airflow and reliable engine operation.
Fits:
Porsche 964 C2 / C4 / RS 1989 - 1994
Porsche 993 Carrera 1994 - 1998
Porsche 993 Turbo
Diagram ref no 7
This rubber sleeve is fitted within the intake manifold system and joins adjoining intake components while allowing a degree of flexibility between them. It is designed to replace an original sleeve that has become cracked, hardened, split or otherwise deteriorated with age.
- Connects components within the intake manifold system
- Helps maintain an airtight intake connection
- Prevents unwanted air leaks
- Accommodates normal engine movement and vibration
- Helps maintain correct airflow to the engine
- Replaces cracked, hardened or perished intake rubber
- Suitable for intake system repair and engine servicing
- OE Match replacement part.
- Rough or unstable idle
- Intake air leaks
- Hesitation during acceleration
- Reduced engine performance
- Difficult engine tuning
- Whistling or hissing noises from the intake system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96411068703
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) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
The OE MATCH Intake Manifold (Part Number 99311071250/1) is a high-quality replacement component designed to restore efficient airflow and reliable engine operation on Porsche 911 (993) Carrera 2, Carrera 4 and Turbo models.
Fits:- Porsche 993 C2 / C4 1994-98
- Porsche 993 Turbo
Diagram Ref No 12
Manufactured to match the original equipment specifications, this intake manifold component forms an important part of the engine's air induction system, helping deliver the required airflow towards the engine's combustion chambers.
The Porsche 993's six-cylinder boxer engine relies on a properly sealed intake system to maintain efficient combustion, consistent throttle response and smooth engine performance. Each intake runner provides a passage for air to travel through the induction system, helping support the engine's intended operating characteristics.
Over time, original intake manifold components can become damaged through heat exposure, engine vibration, ageing and repeated maintenance. Cracks, damaged mounting surfaces or deteriorated connecting sleeves can allow unwanted air to enter the intake system, potentially affecting engine performance and efficiency.
A leaking or damaged intake manifold connection may contribute to rough idling, hesitation during acceleration, reduced engine responsiveness and irregular combustion.
The OE MATCH Intake Manifold provides a practical replacement for a damaged original component, helping restore the correct airflow passage, maintain the integrity of the intake system and preserve the factory engine configuration.
Ideal for Porsche 993 engine maintenance, intake system repairs, air leak diagnosis and classic Porsche restoration projects.
What This Product Does:
The intake manifold is a vital part of the engine's air induction system, responsible for directing air towards the engine cylinders.
Its primary functions include:
- Directs Intake Air: Provides a passage for air to travel through the intake system towards the engine's intake ports.
- Supports Efficient Combustion: Helps deliver the air required for the correct combustion process.
- Maintains Intake System Integrity: Works with the associated rubber sleeves, seals and mounting components to maintain a properly sealed induction system.
- Supports Smooth Engine Operation: Helps maintain consistent airflow for stable idling and normal engine running.
- Maintains Throttle Response: Supports the engine's ability to respond smoothly to changes in throttle demand.
- Reduces Unmetered Air Entry: Correct sealing helps prevent air from entering the system through unintended openings.
- Supports Engine Efficiency: Helps maintain the intended intake arrangement for correct air delivery and combustion.
- Maintains Cylinder Air Supply: Forms part of the individual air intake path serving the engine's six-cylinder configuration.
- Supports Original Engine Performance: Preserves the factory-style intake passage and installation geometry.
- Maintains Original Equipment Fitment: Designed to replace the corresponding factory intake manifold component.
Symptoms Of Wear Or Failure:
The intake manifold and its associated connections are subjected to engine heat, vibration and continuous airflow throughout their service life.
While the manifold runner itself is generally durable, physical damage, ageing seals or deteriorated connecting components can lead to intake air leaks and engine operating problems.
Common symptoms include:
- Rough or Unstable Idle: Unmetered air entering the intake system may cause the engine to idle unevenly.
- Engine Hesitation: Air leaks may contribute to hesitation or inconsistent response during acceleration.
- Reduced Engine Performance: A damaged or leaking intake connection may affect the engine's normal operating characteristics.
- Visible Cracks or Fractures: Physical damage to the manifold may allow air to escape or enter through an unintended opening.
- Intake Air Leaks: Damaged mounting surfaces, seals or connecting sleeves may allow unwanted air into the induction system.
- Hissing or Whistling Noises: Air leaking through a cracked manifold or deteriorated connection may produce noticeable intake noises.
- Irregular Engine Running: Inconsistent intake airflow may contribute to uneven combustion or running quality.
- Increased Fuel Consumption: Intake air leaks may affect engine management corrections and contribute to inefficient operation.
- Engine Management Warning Light: Certain intake-related faults may trigger diagnostic warnings or stored fault codes.
- Damaged Mounting Points: Cracked or distorted mounting areas may prevent the manifold from being securely installed.
- Loose or Deteriorated Rubber Sleeves: Ageing connecting sleeves can lose flexibility, split or allow unwanted air leakage.
- Visible Damage Following Repairs: Incorrect removal, overtightening or accidental impact may damage the original manifold.
Why Replacement Matters:
Replacing a cracked, damaged or leaking intake manifold helps maintain the correct operation and reliability of the Porsche 993's engine air induction system.
Key Benefits of Replacement:
- Restores Correct Intake Airflow: Replaces damaged components to help maintain the intended passage of air towards the engine.
- Helps Eliminate Intake Air Leaks: Restores sealing integrity where the original manifold or its mounting surfaces are damaged.
- Supports Smooth Engine Idling: Helps reduce running irregularities caused by confirmed intake leaks.
- Improves Engine Responsiveness: Restoring the correct intake arrangement can help recover normal throttle response where leakage was affecting performance.
- Maintains Efficient Combustion: Helps preserve the intended air delivery characteristics of the engine.
- Reduces Unmetered Air Entry: Supports correct airflow measurement and engine management operation.
- Protects Engine Reliability: Helps prevent continued operation with an unresolved intake system defect.
- Maintains Factory Specifications: Designed to match the original Porsche intake manifold arrangement.
- Original Equipment-Style Fitment: Provides the appropriate replacement shape and connections for compatible engines.
- Supports Long-Term Engine Performance: Helps preserve normal engine operation by maintaining the integrity of the induction system.
- Ideal During Engine Maintenance: Suitable for replacement during intake system refurbishment or when repairing damaged components.
- Cost-Effective Repair: Allows an individual damaged runner to be replaced without necessarily renewing the entire intake assembly.
- Suitable for Classic Porsche Restoration: Helps maintain the original appearance and configuration of the Porsche 993 engine.
A damaged intake manifold may initially cause only a minor air leak or occasional running irregularity. However, continued operation with an intake leak can result in inconsistent air-fuel mixture control and reduced engine performance.
Replacing a defective runner with an OE MATCH component helps restore the intended intake system configuration and supports reliable engine operation.
Where the original rubber connecting sleeves have hardened, cracked or deteriorated, these should also be inspected and replaced as necessary to ensure the intake system is correctly sealed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311071250
The product you are viewing cross references to these numbers
OEMatch Inlet Manifold — Flow, Response, Refinement
OEMatch supplies inlet manifold items for Porsche models, combining replacement manifolds, gaskets and related seals with an extensive cross-reference catalogue to support fitment and servicing. These products are selected to help restore consistent airflow and engine responsiveness where an ageing or damaged inlet manifold affects performance.
Available Types
- Cast aluminium inlet manifolds
- Composite/plastic inlet manifolds
- Manifold gaskets and seal kits
Understanding OEMatch Inlet Manifold
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original inlet manifold.
OE (Original Equipment) refers to parts matching original specifications for the inlet manifold and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM inlet manifold engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
The inlet manifold itself distributes intake air from the throttle body to each cylinder and helps balance pressure and flow for smooth idling and consistent combustion across the rev range.
Benefits Include
- Restores balanced airflow to each cylinder for stable combustion
- Improves throttle response and idle quality
- Replaces degraded seals to reduce vacuum leaks and emissions
Why Inlet Manifold Wear and Fail
- Heat cycling and material fatigue leading to cracks or leaks
- Carbon and oil buildup restricting runners and passages
- Deterioration of gaskets and seals allowing unmetered air ingress
The Importance of Replacing with OEMatch Inlet Manifold
A leaking or damaged inlet manifold can cause uneven air delivery, rough running and reduced efficiency. Replacing a compromised manifold restores consistent airflow balance, helps protect engine components from lean or overly rich running conditions and supports predictable throttle response for everyday driving and inspection tests.
Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances
- Available with compatible gasket and seal kits for a complete repair
- Manufactured from materials chosen for heat resistance and sealing longevity
