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Porsche > 991 (911) MK1 2012-2016 > 991.1 Turbo S 3.8L (560Bhp) 2014-16 > Engine Tuning >

Performance Plenum

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Aluminum Intake Plenum High Flow Y Pipe Porsche 991 Turbo /S IPD - 91500, 99111005070, 99111005071, 99111005072
2
Aluminum Intake Plenum High Flow Y Pipe Porsche 991 Turbo /S IPD
91500
Product Information
Product Information
TIPD invested countless hours of R & D with a variety of unique design features and multiple prototype tests before settling on an optimum design that significantly improves engine performance for both stock and highly modified 991 Turbos. Our innovative Y-Pipe design is not only larger but also utilizes "non-round" runners, an optimized merge collector area and our proven dimpled interior surfacing. This superior design delivers greater volume of air, improved laminar flow and increased air velocity. These improvements deliver an additional 35+ wheel HP, 40+ Foot Pounds of Torque, improved boost response and more linear power and torque curves.

ipd

As we all know, bigger is not always better when it comes to forced induction applications. The IPD Y-Pipe is considerably larger than the factory but not so large as to cause pressure drop within the intake tract resulting in turbo lag and reduced performance. This optimized "no-round" design with dimpled interior surface cannot be achieved with conventional round tube construction.

The 991 Turbo Y-Pipe is a direct bolt-on engine upgrade that requires no modifications but should be perform by an experienced Porsche technician familiar with the 991 platform. Y-Pipes comes with all the required hardware necessary to complete the installation.

Fits:
Porsche 991 Turbo /S

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Related, superseded, cross reference or alternative numbers for comparison.

91500
91500
99111005070
99111005071
99111005072

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Aluminum Intake Plenum. Porsche 991.1 Turbo /S IPD Intake Plenum 74mm - 91274, 9A111003770
5
Aluminum Intake Plenum. Porsche 991.1 Turbo /S IPD Intake Plenum 74mm
91274
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Product Information
The incredible 991 Porsche Turbo received a completely redesigned exterior but the engine remained virtually identical to the previous model 997.2 Turbo. This latest Turbo is the most powerful, revolutionary and capable Porsche Turbo to ever come out of Stuttgart. This latest generation Turbo engine, titled the 9A1, delivers 520 HP (560 HP with the "S") and once again, raises the proverbial performance bar in the sports car world.

ipd

The new 991 IPD Turbo Plenum is nearly identical to the previous 997.2 Turbo Plenums. The new IPD Turbo Plenum is offered in one single 74mm version which utilizes the factory 74mm throttle body. The 991 Turbo intake manifolds are smaller than the 997.1 Turbo manifolds which is great for improved boost response and gas mileage but less than ideal for making substantial power gains. The 74mm TB provides more than adequate flow for these more restrictive intake runners eliminating the need for a larger 82mm "Competition" version.

The already explosive power of the 991 Turbo can be further increased with the new 991 Turbo IPD Intake Plenum. The patented IPD Plenum design works exceptionally well with all forced induction applications and the 991 Turbo is no exception. Power and torque increases provided by the IPD plenum are impressive and stay well above all factory power curves from launch to redline. Maximum power increases take place in the midrange where it's most needed, most critical and most enjoyed.

The 991 Turbo plenums deliver smooth and linear power with considerably quicker boost response creating a longer and more desirable power band. The Turbo plenums deliver reliable performance for both street and motorsport applications enhancing the already visceral Porsche Turbo driving experience.

The 991 Turbo requires an "adaptation" period that can be fully realized with either a series of hard pulls on the dyno or a series of spirited driving sessions, which of course IPD recommends only be performed on a closed course circuit. Installation of all Turbo Plenums is highly recommended to be performed by qualified and trained Porsche technicians.

Fits:
Porsche 991.1 Turbo

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

91274
91274
9A111003770

The product you are viewing cross references to these numbers
Inlet plenum replacement O-ring. Porsche 991 Turbo - DO88
1
Inlet plenum replacement O-ring. Porsche 991 Turbo
TR-210-991-O-RING
Product Information
Product Information
Inlet plenum replacement O-ring.

doeighteight

To Fit:
Porsche 991 Turbo and Turbo S from 2013 onwards *** using the do88 TR-210-991 Inlet Plenum

Replacement O ring, required if you are disconnecting the inlet plenum whilst maintaining your car to provide a good seal and prevent air leaks.
DISPLAYING 1 to 3 (of 3 products)
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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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