Porsche > 964 (911) (1989-1994) > 964 (911) C4 1989-93 > Engine Rebuild Parts > Air Intake & Injection >

Inlet Manifold

Intake manifold gasket. Porsche 964 / 993

99311071301

Product Information

Intake manifold gasket. Sold each.

porsche

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Related, superseded, cross reference or alternative numbers for comparison.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

99311071301

96411071300

96411071301

40-77522-10

407752210

526.730

The product you are viewing cross references to these numbers

Intake manifold gasket. Porsche 964 / 993

99311071301/1

Product Information

Intake manifold gasket.

oematch

18754

99311071301

96411071300

96411071301

40-77522-10

407752210

526.730

The product you are viewing cross references to these numbers

Intake manifold rubber sleeve. Porsche 964 / 993

96411068703

Product Information

Intake manifold rubber sleeve.

porsche

Fits:
Porsche 964 C2 / C4 / RS 1989-94
Porsche 993 Carrera 1994-98
Porsche 993 Turbo

Click 'Zoom in' for large parts diagram.
Diagram ref no 7

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Related, superseded, cross reference or alternative numbers for comparison.

96411068703

96411068703

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Intake manifold rubber sleeve. Porsche 964 / 993

96411068703/8

Product Information

Intake manifold rubber sleeve.

Fits:
Porsche 964 C2 / C4 / RS 1989-94
Porsche 993 Carrera 1994-98
Porsche 993 Turbo

Diagram ref no 7

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Related, superseded, cross reference or alternative numbers for comparison.

96411068703

96411068703

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8 8 8 8 8 8 8 8

Intake manifold set GT3 style. Porsche 964 / 993 / 996

99611061996

Product Information

Intake manifold set GT3 style.
Sold as a pair

Fits:
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 996 - 1997 to 2005

Introducing the Silverlake Porsche 911 GT3-style intake manifolds, designed for both ITB (Individual Throttle Bodies) or DBW (Drive-By-Wire) applications. These manifolds are compatible with air-cooled and water-cooled Porsche engines, offering a lightweight and high-performance alternative to the OEM cast aluminum version.

Available in two advanced materials: temperature-cured carbon fiber prepreg or glass fiber-reinforced thermoplastic, each plenum weighs just 825 grams (1.8 lbs), significantly lighter than the 2400 grams (5.3 lbs) of the stock aluminum version. This results in a total weight reduction of 3.15 kg (7 lbs) per pair — a 65% savings compared to the original.

Engineered and flow bench tested to ensure optimal airflow volume, the carbon fiber version features a matte finish, while the thermoplastic model comes painted in black, with the option for custom repainting. Both versions are free of logos, providing a clean, personalized look.

The kit includes two manifolds/plenums, the high-temperature silicone couplers are available separately.

This product replaces Porsche part 99611061996

Related reference numbers
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99611061996

99611061996

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6 6 6 6 6 6

Intake manifold stack set in aluminium. Porsche 964 3.6ltr

96411071101/5

Product Information

Intake manifold stack set.
Sold as a set of 6

Fits:

Porsche 964 Carrera 2 - 1990 to 1994
Porsche 964 Carrera 4 - 1989 to 1994

PMO Induction have designed an intake manifold “stack” in 356A aluminum, die-cast and machined specifically for your 3.6ltr Porsche 964 from 1990 to 1994.

Replace your cracked, warped or damaged plastic stacks with a permanent solution impervious to engine compartment heat cycles. Solid Works CAD designed and CNC machined for a perfect, long-lasting fit. Anodized black with a machined bore for improved flow characteristics.

Includes 6 x base gaskets to complete the installation.
Compatible with forced induction applications and high boost environments.
PMO Induction logo laser etched into the manifold base (not visible when installed for a clean, period correct look).

Diagram ref no 9 and 10

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

96411071101

96411071101

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3 3 3

Intake manifold. Porsche 964

96411071101

Product Information

Intake manifold.

porsche

Fits:
Porsche 964 C2 / C4 1989-94
Porsche 964 RS

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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

96411071101

96411071101

96411031500

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6 6 6 6 6 6

Intake system for individual throttle bodies carbon fibre. Porsche 964 / 993

SL-ITB-CF

Product Information

Intake system for individual throttle bodies carbon fibre.

Fits:
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998

Silverlake Projects presents a complete intake system for air-cooled Porsche 964/993 engines equipped with ITBs (Individual Throttle Bodies), designed for maximum performance and efficiency.

The intake system includes:

2 x GT3-style intake manifolds in carbon fiber
Glass-reinforced thermoplastic intake T-tube for air filter connection
Resonance flap or resonance flap delete tube in glass-reinforced thermoplastic, complete with vacuum actuator
6 x high-temperature silicone couplers for manifold-to-runner connections
4 x high-temperature silicone couplers for manifold-to-T/resonance flap connections
TMAP sensor for accurate manifold pressure readings
All mounting fasteners in lightweight titanium alloy
Vacuum reservoir for optimal pressure management

Weighing just 4.5 kg (9.9 lbs), this system is significantly lighter than the stock 964 intake, which weighs 11.5 kg (25.3 lbs).

Why choose our system?

50% lighter than stock: A combination of carbon fiber, thermoplastics, and titanium results in a remarkably light system.
Fuel rail precision mounting: Direct mounting to the runner ensures perfect injector press fit.
Superior heat insulation: CNC-machined PTFE inserts between the cylinder head and runner offer exceptional heat protection, especially in idle or street driving conditions.
Perfect sealing: Custom nitrile O-rings between the runner and cylinder head, as well as the intake T and throttle body, guarantee a secure, leak-free fit.
Premium silicone sleeves: Silverlake’s precision-molded OEM+ silicone sleeves provide superior temperature resistance and ensure a flawless fit with all components, delivering better airflow and an unmatched look.
Titanium fasteners: Tin-coated titanium alloy hardware not only reduces weight but also enhances the system’s aesthetic appeal.

This intake system is built for those seeking the ultimate performance, weight savings, and durability for their Porsche 964/993 engine.

6 6 6 6 6 6

Intake system for individual throttle bodies glass reinforced thermoplastic. Porsche 964 / 993

SL-ITB-GRP

Product Information

Intake system for individual throttle bodies glass reinforced thermoplastic.

Fits:
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998

Silverlake Projects presents a complete intake system for air-cooled Porsche 964/993 engines equipped with ITBs (Individual Throttle Bodies), designed for maximum performance and efficiency.

The intake system includes:

2 x GT3-style intake manifolds in glass-reinforced thermoplastic
Glass-reinforced thermoplastic intake T-tube for air filter connection
Resonance flap or resonance flap delete tube in glass-reinforced thermoplastic, complete with vacuum actuator
6 x high-temperature silicone couplers for manifold-to-runner connections
4 x high-temperature silicone couplers for manifold-to-T/resonance flap connections
TMAP sensor for accurate manifold pressure readings
All mounting fasteners in lightweight titanium alloy
Vacuum reservoir for optimal pressure management

Weighing just 4.5 kg (9.9 lbs), this system is significantly lighter than the stock 964 intake, which weighs 11.5 kg (25.3 lbs).

Why choose our system?

50% lighter than stock: A combination of carbon fiber, thermoplastics, and titanium results in a remarkably light system.
Fuel rail precision mounting: Direct mounting to the runner ensures perfect injector press fit.
Superior heat insulation: CNC-machined PTFE inserts between the cylinder head and runner offer exceptional heat protection, especially in idle or street driving conditions.
Perfect sealing: Custom nitrile O-rings between the runner and cylinder head, as well as the intake T and throttle body, guarantee a secure, leak-free fit.
Premium silicone sleeves: Silverlake’s precision-molded OEM+ silicone sleeves provide superior temperature resistance and ensure a flawless fit with all components, delivering better airflow and an unmatched look.
Titanium fasteners: Tin-coated titanium alloy hardware not only reduces weight but also enhances the system’s aesthetic appeal.

This intake system is built for those seeking the ultimate performance, weight savings, and durability for their Porsche 964/993 engine.

4 4 4 4

Silicone coupler sleeve set for GT3 intake manifold plenum to throttle body. Porsche 964 / 993 / 996

99611068650/1

Product Information

Silicone coupler sleeve set for GT3 intake manifold plenum to throttle body.
Sold as a set of 4

Fits:
Porsche 964 - 1989 to 1994 (with GT3 inlet upgrade)
Porsche 993 - 1994 to 1998 (with GT3 inlet upgrade)
Porsche 996 - 1997 to 2005 (with GT3 inlet upgrade)

The original rubber couplers for Porsche 996 and 997 GT3 models have become increasingly costly and hard to source, and many enthusiasts opt to avoid them for high-performance applications like hot rods or track cars due to their limited heat resistance.

Our precision-molded OEM+ silicone sleeves are the perfect direct replacement, offering double the temperature resistance of the original rubber couplers along with an enhanced appearance. These high-quality sleeves are essential for replacing worn-out rubber parts and are ideal for air-cooled hot rods undergoing a modern DBW (Drive-By-Wire) conversion using a GT3 intake plenum.

This set includes four silicone sleeves

Replaces Porsche part number 99611068552 and 99611068650

Diagram ref no 9 and 11

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99611068650

99611068551

99611068552

99611068553

99611068650

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Silicone sleeve set for GT3 intake manifold. Porsche 964 / 993 / 996

99611068792/1

Product Information

Silicone sleeve set for GT3 intake manifold. Porsche 964 / 993 / 996
Sold as a set of 6

silverlake

This set includes six (6) silicone sleeves

Replaces Porsche part numbers 99611068792 and 99611068790

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

99611068792

99611068792

99611068790

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4 4 4 4

Threaded union for intake manifold. Porsche 964

99923037802

Product Information

Threaded union for intake manifold. 8/M 16 X 1,5.

porsche

Fits:
Porsche 964 C2 / C4 3.3L 1990-92 Engine code 3069
Porsche 964 C2 / C4 3.6L 1992-94 Engine code 6450

Click 'Zoom in' for large parts diagram.
Diagram ref no 57

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99923037802

99923037802

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About Inlet Manifold

Air Inlet Manifolds – Precision Airflow Distribution for Porsche Engines

Air inlet manifolds, often referred to as intake manifolds, are vital components in Porsche engines that ensure even air distribution to each cylinder. By controlling the air supply entering the combustion chambers, these manifolds optimise engine breathing, improving fuel efficiency, throttle response, and overall performance.

At Design911, we supply a wide range of genuine and high-quality air inlet manifolds for numerous Porsche models, including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each unit is crafted from high-strength materials to deliver consistent airflow, exceptional durability, and precise fitment — maintaining your Porsche’s power and refinement.

What Do Air Inlet Manifolds Do?

The air inlet manifold is a critical part of the intake system that manages and distributes air from the throttle body into the engine’s cylinders. Its functions include:

Delivering uniform airflow to each cylinder for efficient combustion.
Optimising torque and power output across all engine speeds.
Balancing air pressure for smoother idling and acceleration.
Enhancing engine cooling and fuel economy through consistent airflow management.

In performance-oriented Porsche engines, the air inlet manifold is carefully tuned to maximise airflow dynamics — contributing directly to the car’s responsiveness and driving feel.

Why Do Air Inlet Manifolds Fail?

Air inlet manifolds operate under constant pressure, heat, and vibration, which can lead to deterioration over time. Common causes of failure include:

Cracks or leaks in plastic or aluminium housings due to heat cycling.
Carbon buildup restricting airflow through the manifold runners.
Faulty gaskets or seals allowing unmetered air to enter the system.
Vacuum leaks affecting idle stability and performance.
Mechanical damage caused by backfires or overpressure.

Symptoms of a failing air inlet manifold may include rough idling, loss of power, engine misfires, increased fuel consumption, or a check engine light related to air intake irregularities.

Why Replace a Damaged Air Inlet Manifold?

A cracked or leaking air manifold can cause air imbalance, poor combustion, and reduced engine efficiency. Replacing the component restores smooth airflow, optimises fuel economy, and protects engine health.

Benefits of replacement include:

Restored airflow and balanced combustion.
Improved throttle response and power delivery.
Reduced emissions and improved fuel efficiency.
Long-term reliability with manufacturer-quality precision.

All air inlet manifolds available at Design911 are made with high-quality materials, precision-engineered sealing surfaces, and optimised airflow geometry — ensuring lasting durability and peak performance in both standard and high-performance Porsche engines.

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Inlet Manifold

Inlet Manifold