Performance Plenum
The DFI Porsche engine package is a finely tuned performance machine and additional power has proved difficult to find. The unique design of Porsche's new DFI intake system posed very challenging tuning hurdles but once again IPD developed a design that out performs the factory intake system without compromising reliability and drive-ability.
This innovative and revolutionary IPD DFI Intake Plenum employs the patented "Y" design as well as an enlarged plenum area that allows for improved intake air speed and air velocity resulting in performance increases without any power loses.
The all new specifically designed IPD 3.4L DFI Cayman/Boxster Plenum is a direct bolt-on upgrade that replaces the factory plenum and utilizes all pre-existing factory hardware including the OE factory throttle body.
The improved IPD intake design allows for smoother, less turbulent and more efficient air flow with higher velocity air intake speed creating impressive power and torque gains.
The superior design of the DFI IPD Plenum provides an additional 12-14 horsepower at the wheels. Unlike previous naturally aspirated IPD plenums that delivered stronger gains in the mid range, the new IPD DFI Plenums deliver a similar shaped power curve as the factory but are considerably stronger from the mid range to redline.
Power output in the lower rev range follows the Porsche factory output, with NO loses. Power and torque are realized in the midrange and continue to climb above factory power outputs all the way up to redline.
Installation of the new IPD 3.4L DFI Plenum is relatively straight forward and can be installed by mechanically inclined DIY customers although IPD strongly recommends installation be performed by a trained and qualified Porsche technician.
Fits:
Porsche 987 GEN2 Cayman S 3.4L DFI
Porsche 987 GEN2 Boxster S 3.4L DFI
Porsche 987 GEN2 Cayman 2.9L DFI
Porsche 987 GEN2 Boxster 2.9L DFI
- Porsche Boxster 987 MKII 2.9L 2009-2012
- Porsche Boxster S 987 MKII 3.4L 2009-2012
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
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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.
