Inlet Manifold
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.
- 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
Shop Securely
12 Month Warranty
Worldwide Delivery
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.
- 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
Shop Securely
12 Month Warranty
Worldwide Delivery
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99611068650
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
Shop Securely
12 Month Warranty
Worldwide Delivery
Silicone sleeve set for GT3 intake manifold. Porsche 964 / 993 / 996
Sold as a set of 6
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 six (6) silicone sleeves
Replaces Porsche part numbers 99611068792 and 99611068790
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99611068792
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
Shop Securely
12 Month Warranty
Worldwide Delivery
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.
