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Porsche > 911 & 912 (1965-1989) > 911 1978-1989 3.3L Turbo (930) > Engine Tuning >

Performance Plenum

Performance Plenum

DISPLAYING 1 to 2 (of 2 products)
GT3 Intake Manifold Pair. Porsche 911 / 964 / 993 Air-Cooled (Adapt Motorsport) - AMS9050289
4
GT3 Intake Manifold Pair. Porsche 911 / 964 / 993 Air-Cooled (Adapt Motorsport)
AMS9050289
Product Information
Product Information

Adapt Motorsport GT3 intake manifolds for air-cooled Porsche 911 engines using the brand's intake conversion system. Supplied as a pair, they combine cast-aluminium construction with geometry developed specifically for the shorter spacing of air-cooled engines.

Fits:

  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50
  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 911 1978-1989 3.3L Turbo (930)
  • 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
  • Porsche 993 (911) TURBO S 1994-97


What This Product Does

These manifolds adapt the Porsche GT3 intake manifold concept for air-cooled 911 engine architecture. Their interfaces accommodate the shorter engine spacing, while computational fluid dynamics modelling was used during development to refine the internal airflow geometry.

Functions

  • Provides GT3-style intake manifolds for compatible air-cooled engine conversions
  • Interfaces with Adapt Motorsport DBW intake adapters and throttle kits
  • Provides vacuum connections for the brake booster and idle-air bypass
  • Supports additional vacuum-source requirements within a custom installation
  • Uses discreet tabs to secure wiring and vacuum-control components


Technical Details

  • Supplied as a pair of intake manifolds
  • Cast-aluminium construction
  • Designed for the shorter intake spacing of air-cooled Porsche 911 engines
  • Factory-style external lugs are omitted for a cleaner installation
  • Additional integrated vacuum ports
  • Matching adapter sleeves are optional components for connection to the intake adapters, throttle body and resonance flap

FAQs

  • Is this a complete intake system? This product consists of a pair of intake manifolds. Matching adapter sleeves and other intake-system components are separate elements.
  • What material are the manifolds made from? They are manufactured from cast aluminium for a factory-style appearance.
  • Are vacuum connections included? Yes. The manifolds incorporate ports for brake-booster vacuum, idle-air bypass and other vacuum-source requirements.
  • Can they be used with electronic throttles? They are designed to integrate with Adapt Motorsport DBW intake adapters and throttle kits.

Check fitment for your specific vehicle, engine specification and intake conversion before ordering.

Resonance Flap Vacuum Actuator Kit for Manifold Upgrade. Porsche 911 / 964 / 993 - AMS9050146
2
Resonance Flap Vacuum Actuator Kit for Manifold Upgrade. Porsche 911 / 964 / 993
AMS9050146
Product Information
Product Information

Adapt Motorsport resonance flap vacuum actuator kit for air-cooled Porsche 911 engines using 964, 993 or 996 GT3 intake manifolds. It provides the vacuum control components in a compact assembly supported by an automotive-grade nylon bracket.

Fits:

  • 911 1974–1977 2.7L / 1976–77 3.0 Carrera
  • 911 1978–1983 3.0L / SC
  • 911 1984–1986 3.2L
  • 911 1987–1989 3.2L G50
  • 911 1975–1977 3.0L Turbo (930)
  • 911 1978–1989 3.3L Turbo (930)
  • 964 (911) C2 1989–93
  • 964 (911) C4 1989–93
  • 993 (911) C2 1994–97
  • 993 (911) C4 1994–97
  • 993 (911) C2S 1994–97
  • 993 (911) C4S 1994–97


What This Product Does

This kit supplies the vacuum equipment required to operate the intake manifold resonance flap on a classic air-cooled engine conversion. Its components are arranged together on a nylon support bracket to simplify installation and vacuum-line routing.


Functions

  • Provides vacuum actuation for the intake manifold resonance flap
  • Maintains vacuum through the supplied reservoir and check valve
  • Uses a solenoid actuator to control the vacuum circuit
  • Connects the system through the supplied hose, T-piece and tubing


Technical Details

  • Suitable for classic air-cooled engines using 964 or 993 intake manifolds
  • Also designed for conversions using a 996 GT3 intake manifold
  • Includes a vacuum canister, check valve and solenoid vacuum actuator
  • Supplied with a solenoid connector kit, T-piece, vacuum hose and interconnecting tubing
  • Automotive-grade nylon support bracket and installation fasteners included
  • Mounts directly to the Adapt Motorsport 964 drive-by-wire throttle conversion kit; installation with the GT3 kit requires a separate bracket made by the installer


Check fitment for your specific vehicle, engine, intake manifold and throttle conversion before ordering.

DISPLAYING 1 to 2 (of 2 products)
About Performance Plenum

Performance Plenums – Maximise Airflow, Power & Efficiency for Your Porsche

A performance plenum is a critical upgrade for Porsche enthusiasts looking to improve throttle response, airflow efficiency, and overall engine performance. Sitting between the throttle body and intake runners, the plenum distributes incoming air evenly across all cylinders — ensuring consistent combustion and optimised power delivery.

At Design911, we offer a premium range of performance-engineered plenums designed specifically for Porsche models. Constructed from lightweight aluminium, carbon fibre, or composite materials, these units feature advanced internal flow geometry to reduce turbulence and increase air velocity.

Whether you’re enhancing a classic 911 or tuning a modern Cayman, our high-quality plenums are developed to deliver proven performance gains, sharper throttle response, and a more linear torque curve — perfect for both road and track use.

What Do Performance Plenums Do?

The plenum serves as an air distribution chamber that balances airflow between the cylinders. Upgrading to a performance plenum improves air charge efficiency, resulting in smoother engine breathing and increased power output.

Core Functions:

  • Distribute intake air evenly to all engine cylinders.
  • Optimise airflow dynamics for faster throttle response.
  • Increase air velocity and reduce pressure loss.
  • Improve torque and mid-range performance.
  • Enhance engine efficiency and fuel-air mixture stability.

A well-designed plenum ensures that every cylinder receives the right amount of air at the right time — unlocking smoother acceleration and more consistent power.

Why Do Plenums Fail or Require Replacement?

Over time, standard plenums can suffer from material fatigue, cracks, or restricted internal passages, all of which impact performance and reliability.

Common Causes of Failure Include:

  • Cracks or leaks from heat cycling and vibration.
  • Carbon build-up restricting airflow.
  • Worn gaskets or seals causing pressure loss.
  • Plastic deformation under extreme boost or temperature.
  • Reduced efficiency due to outdated or restrictive design.

Signs of a failing plenum include loss of throttle response, poor fuel economy, uneven idle, or reduced torque. Replacing it with a performance-engineered unit restores full airflow efficiency and reliability.

Why Upgrade to a Precision-Engineered Performance Plenum?

Upgrading your Porsche’s intake system with a high-performance plenum enhances power delivery, throttle sharpness, and efficiency — particularly when combined with a performance air intake and tuning.

Key Benefits:

  • Increases horsepower and torque throughout the rev range.
  • Delivers faster throttle response and improved drivability.
  • Constructed from lightweight, heat-resistant materials.
  • Improves airflow balance and reduces pressure drop.
  • Direct-fit compatibility for Porsche 911, Cayman, Boxster, and more.
  • Ideal for performance tuning, track driving, and high-output builds.

Replacing restrictive intake components with a performance plenum unlocks your Porsche’s full potential, ensuring stronger mid-range power and greater engine efficiency.

Highlights:

  • Performance-engineered plenums for Porsche tuning and upgrades.
  • Improves airflow distribution, power delivery, and throttle response.
  • Built from aluminium or carbon fibre for strength and weight reduction.
  • Direct-fit installation with precision-sealed fittings.
  • Perfect for high-performance, racing, or spirited road driving.
  • Enhances engine sound and overall responsiveness.

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