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Manifold / Headers

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DISPLAYING 1 to 4 (of 4 products)
E-PO/T/6/1
Product Information
Product Information
Akrapovic Evolution header set (Titanium)

Fits:
Porsche 911 GT3 RS (991.2) with OPF/GPF 2019 - 2020
Porsche 911 Speedster with OPF/GPF 2019 - 2020

Evolution Header Set (Titanium) must be mounted together with:
• Slip-On Line (Titanium) system S-PO/TI/15
or
• Slip-On Race Line (Titanium) system S-PO/TI/8.
An additional original Porsche stock bracket (Porsche p/n: 99111147391) is required for mounting the Akrapovič exhaust system. Please read the instructions carefully before the start of the installation.



Evolution Header Set converts the slip-on system into a full system designed to give noticeably increased power at higher revs. Handcrafted titanium headers incorporate 100 cpsi sports catalytic convertors and side mufflers—all designed to increase power and torque—the Evolution Header Set utilizes integrated catalytic convertors and the functionality of the exhaust valves to deliver an out-and-out attack on the senses. With the valves in the open position, it delivers a sportier and hard-hitting sound, but also has the option of a lower sound level when the valves are closed, perfect for use in more everyday locations. Offering an increased weight savings in the area behind the engine and the rear axle, the reduction will enhance the handling and improve performance.

When installing Akrapovič aftermarket optional link pipes with sports catalytic converters or without catalytic converters, which are developed for use on closed tracks only, remapping the ECU is mandatory. When installing Akrapovič aftermarket exhaust system that was developed for use on closed tracks, we recommend remapping the ECU in order to prevent potential »check engine light« warning signals.

NOTE: Sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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Related, superseded, cross reference or alternative numbers for comparison.

E-PO
9GT254400B
9GT254400E
9GT254450B
9GT254450E

The product you are viewing cross references to these numbers
TITANSTUDS18
Product Information
Product Information
These titanium components are resistant to rust and corrosion, which can be a common issue with traditional steel studs and nuts. This corrosion resistance ensures that the studs and nuts maintain their integrity, allowing for easy removal and installation when necessary. They are the perfect upgrade for Porsche enthusiasts who demand the ease of access to vehicle's exhaust system. 

rohler

• Ultra-high-performance product
• Use of Titanium Ti6Al4V technology

Contains 18 x Studs (38mm), Nuts & Washers

Fits:
Porsche 996 Turbo / GT3 / GT2
Porsche 997 Turbo / GT3 / GT2
Porsche 997.2 ALL
Porsche 991 ALL
Porsche 992 ALL
Porsche 987 2009-12
Porsche 981
Porsche 718 GT4

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

TITANSTUDS18
90037813100
90037822709
99907507400
90037822701
99907353501
99907507400
99907353501
99907507400

The product you are viewing cross references to these numbers
90021901500/1
Product Information
Product Information
Screw plug for lambda hole, M18x1.5 mm.

oematch

Fits:
Porsche 924S 2.5L 1987-88 (Engine M44.09/M44.10)
Porsche 944 2.5L 1987-90 (Engine M44.09/M44.10)
Porsche 944 Turbo 2.5L 1985-91
Porsche 944S 2.5L 1986-88 (Engine M44.40)
Porsche 944 2.7L 1988-89
Porsche 944 3.0L 1988-91
Porsche 996 GT3 3.6L 1999-05
Porsche 968 3.0L 1991-95
Porsche 986 Boxster 2.5L 1996-99 (Engine M96.20)
Porsche 986 Boxster S 2.7L-3.2L 1999-04
Porsche 993 3.6L-3.8L 1993-97
Porsche 997 3.6L 2004-08 (Engine M95.05)
Porsche 997 3.8L 2004-08 (Engine M97.01)

Click 'Zoom in' for large parts diagram.
Diagram ref no 20

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

90021901500
90021901500

The product you are viewing cross references to these numbers
SL-TI-18
Product Information
Product Information
High performance stud + nut kits for the exhaust manifold to cylinder head for Porsche. Using titanium and Inconel alloy studs, aerospace lock nuts, and a well-thought and balanced combination of metals and plating/coatings, our fasteners will perform better than the traditional fastener. They will never oxidize, and hence will unscrew easily when required.

silverlake

Novel ultra-high-performance product
• Use of Titanium Ti6Al4V technology
• Extreme perceived quality

Contains 18 x Studs, Nuts & Washers

Fits:
Porsche 996 Turbo / GT3 / GT2
Porsche 997 Turbo / GT3 / GT2
Porsche 997.2 ALL
Porsche 991 ALL
Porsche 992 ALL
Porsche 987 2009-12
Porsche 981
Porsche 718 GT4

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

SL-TI-18
90037813100
90037822709
99907507400
90037822701
99907353501
99907507400
99907353501
99907507400

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
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About Manifold / Headers

Porsche Exhaust Manifolds / Exhaust Headers | Performance, Flow & Efficiency

Exhaust manifolds or exhaust headers are critical components of your Porsche’s exhaust system, designed to collect exhaust gases from the engine cylinders and direct them into the exhaust system for efficient expulsion. Precision-engineered for performance, these components play a vital role in improving engine breathing, power output, and fuel efficiency.

At Design911, we supply a wide range of high-performance and replacement exhaust manifolds for Porsche models, including the 911, Cayman, Boxster, Panamera, and Macan. Each unit is crafted to high-level specifications, ensuring optimal flow dynamics, corrosion resistance, and long-term reliability under high-heat conditions. Whether you’re restoring a classic or upgrading a modern performance engine, our manifolds and headers deliver the quality and performance your Porsche deserves.

What Do Exhaust Manifolds / Headers Do?

The exhaust manifold collects gases from multiple engine cylinders and funnels them into a single exhaust pipe. In performance applications, headers replace standard manifolds to optimise exhaust flow and reduce back pressure. This increases horsepower, torque, and throttle response, while improving the engine’s overall efficiency.

Core Functions:

  • Channels exhaust gases from engine cylinders into the exhaust system.
  • Reduces back pressure for smoother exhaust flow.
  • Enhances power output and throttle response.
  • Improves exhaust scavenging efficiency.
  • Supports emissions and fuel economy control.

Upgrading or maintaining your exhaust manifold is essential for sustaining optimal engine performance and ensuring clean, unrestricted exhaust flow.

Why Do Exhaust Manifolds Fail?

Operating under constant heat cycles and vibration, exhaust manifolds are subject to wear, corrosion, and cracking over time — especially in performance-driven vehicles.

Common Causes of Failure Include:

  • Thermal expansion and contraction leading to cracks or warping.
  • Corrosion from moisture, salt, or condensation.
  • Loose or broken mounting studs and bolts.
  • Exhaust gasket failure causing gas leaks.
  • Material fatigue due to extreme temperature fluctuations.

A failing manifold or header can cause ticking noises, exhaust leaks, loss of power, and reduced fuel efficiency — all indicators that replacement is necessary.

Why Replace or Upgrade Your Exhaust Manifold / Header?

Replacing a damaged exhaust manifold or upgrading to a high-flow performance header provides significant benefits for both reliability and performance.

Key Benefits:

  • Restores smooth exhaust flow and eliminates leaks.
  • Improves horsepower and torque across the rev range.
  • Enhances fuel economy and throttle response.
  • Reduces engine strain and exhaust back pressure.
  • Crafted from high-grade stainless steel or cast materials.
  • Precision fitment for Porsche 911, Cayman, Boxster, and more.

Whether maintaining your daily driver or upgrading for track use, a new manifold or header ensures optimal exhaust flow and maximum performance efficiency.

Highlights:

  • High-quality exhaust manifolds and performance headers for Porsche.
  • Designed for optimal gas flow and exhaust scavenging.
  • Built from corrosion-resistant stainless steel or cast iron.
  • Direct-fit compatibility for multiple Porsche models.
  • Enhances performance while maintaining exhaust efficiency.
  • Ideal for restoration, performance tuning, or regular replacement.

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