Dr. Jekill & Mr. Hyde exhaust for Porsche 911 G-Models

Porsche 911 G-Model exhaust

Dr. Jekill & Mr. Hyde: No. 1 in adjustable exhaust systems since 1997Dr. Jekill & Mr. Hyde presents the 1st street legal electronically adjustable exhaust for Porsche 911 G-Models

The world's first electronically adjustable, fully type-approved exhaust for the Porsche 911 G-model. Three sound modes. OEM design. No compromises — legal, reversible, and engineered to preserve every characteristic of your flat-six.

The Porsche 911 G-model has always been defined by one thing above all else: the unmistakable character of its air-cooled flat-six. Raw, mechanical, emotional. But over time, that sound has been softened, restricted, or simply lost.

In 2026, that changes.

For the first time, an electronically adjustable exhaust system has been engineered specifically for the G-model — fully ECE type-approved, completely reversible, and designed to integrate as if it left Stuttgart that way. No compromises. No visual disruption. No legal uncertainty.

Three distinct sound modes give you complete control over how your 911 expresses itself. Refined when it needs to be. Alive when you want it to be. And unmistakably authentic when it matters most.

Built without compromise
Every decision in this product starts with one rule: preserve the original character of the 911. Nothing added that shouldn't be there. Nothing removed that should.

Three sound modes
Electronic valve control lets you adapt the character of your car — from refined daily driver to the raw, open sound the Porsche 911 was built for:

  • Valve Closed · Dr. Jekill
    Refined and quiet. Ideal for early morning drives, residential areas, or whenever you need the car to disappear into the background. Fully street legal.
  • Valve Balanced · Dynamic
    The perfect everyday balance. You hear the characteristic Porsche flat-six without drone at motorway speeds. Precision-engineered for resonance-free performance.
  • Valve Open · Mr. Hyde
    The full air-cooled experience. Open valve, pure engine character. Everything an original 911 should sound like — from cold start to full throttle.


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Sign up now for your chance to win a completely free Dr. Jekill & Mr. Hyde exhaust system during the official launch later this year. One winner will be selected when the system is officially released.

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The air-cooled sound you've been missing. Dr. Jekill & Mr. Hyde’s for Porsche 911 G-Models: Key Benefits  

Every detail of this system is built around one principle: enhance the driving experience without altering what makes the Porsche 911 G-model so iconic. No unnecessary additions. No compromises in design, sound, or engineering. Just a precise evolution of what was already right.

From full ECE type approval to drone-free acoustics, from plug & play installation to a factory-correct appearance — everything works in harmony with the car, not against it. Engineered to perform. Designed to disappear. Built to last.

Because the best upgrade is the one that feels like it was always meant to be there.

  • Built without compromise: Every decision in this product starts with one rule: preserve the original character of the 911. Nothing added that shouldn't be there. Nothing removed that should.
  • ECE type approval: Drive anywhere in Europe without worrying about emissions tests or police check. Legal from day one.
  • Drone-free sound engineering: Every aftermarket exhaust has a motorway drone. Ours doesn't. Over 25 years of acoustic engineering make the difference you'll notice the first time you drive.
  • Plug & play — fully reversible: No modifications to the car. Installed by a specialist in a single session. Remove it tomorrow and the car is as it left Stuttgart.
  • Designed to look factory-fitted: Purists won't know it's there. Collectors won't object. The exterior finishes and proportions follow original Porsche specifications exactly.
  • German engineering. Dutch craftsmanship: Made to the same tolerance standards as OEM exhaust components. Resistant to corrosion, heat fatigue, and the specific challenges of air-cooled running temperatures.
  • 2 till 4-year dealer warranty: Fitted by a specialist who knows your car. Backed by the longest warranty in the aftermarket exhaust segment.
Back in time

Dr. Jekill & Mr. Hyde
A bit of history

Every success starts out small. Even though Dr. Jekill & Mr. Hyde is now an established brand within the motorcycle world, it was only a little more than 25 years ago that Dr. Jekill & Mr. Hyde was merely an idea.

Back in 1997 when the first Dr. Jekill & Mr. Hyde systems were created the word ‘custom-made’ was the most appropriate term to describe the products. It did not matter which bike you rode, if it was a big cruiser or a racing rocket, an exhaust would be built especially for your bike. Because of the success of these exhaust systems and a good nose for business Jacques van de Kerkhof decided he wanted to invest in The Jekill and Hyde Company, under the condition that it would be professionalized.

Exhausts

From custom to legal

The next step for The Jekill and Hyde Company was to build an exhaust that would be 100% legal and in compliance with European law. The engineers kept working hard on this, but never got to this point, until Jacques met Mario Müller. Mario already had a lot of experience as an engineer in the motorcycle industry. This cooperation finally resulted in the creation of an exhaust system that was 100% legal and in 2010 the European Type Approval was finally obtained. With still only 4 employees working for the company it was time to conquer the European market. The system proved to be successful, especially in countries where the law was strictly enforced regarding illegal exhaust systems, a Dr. Jekill & Mr. Hyde system was the ideal solution for all those who wanted to experience the ultimate riding feeling, without being afraid to end up on the wrong side of the law.

Exhausts

Branching out

After Europe the step was taken to also provide the rest of the world with Dr. Jekill & Mr. Hyde | The Exhaust. After offices were set up in Germany, Switzerland and France, the company branched out in Canada, Singapore, Japan and more. Besides exploring new markets, the palette of brands The Jekill and Hyde Company develops exhaust systems for, keeps growing. Where there was first a focus on large big twin bikes like Harley-Davidson, Indian and Victory, it also became clear that more brands could use an upgrade with the Dr. Jekill & Mr. Hyde sound. First the R-series of BMW got added to the roster and subsequently it became possible to equip your KTM with a Dr. Jekill & Mr. Hyde | The Exhaust.

valve

The future

The Jekill and Hyde Company continues to grow and expand. For example, in 2021 a completely new motorcycle was added to the range with the BMW R18 and with Triumph Motorcycles a completely new brand has become part of the family. The Jekill and Hyde Company  started with a few models, but are already expanding the range. In this way, the company is always looking for new models and new markets.

A lot has happened in the short time from an idea to a well-known brand and a lot has changed, yet the main principle has always stayed the same. The Jekill and Hyde Company still produces exhaust systems with three distinct personalities and keeps giving the motorcycle rider the ultimate riding experience.

1997
The start of The Jekill and Hyde Company.
2011
Received the European Type Approval.
2015
First ‘non-chopper’ brand is added with the Honda Goldwing.
2016
Dr. Jekill & Mr. Hyde | The Exhaust for BMW.
2017
Added KTM to the roster.
2021
Added Triumph to the roster.
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Cars & Coffee Dr. Jekill & Mr. Hyde Exhausts

first look Cars & Coffee x Dr. Jekill & Mr. Hyde Exhausts

On May 2, Dr. Jekill & Mr. Hyde Exhausts welcomed the Classic Porsche 911 & 912 Club Netherlands and vierenzestig.nl to their headquarters in Belfeld. Known for high-end motorcycle exhausts, the company recently introduced its first prototype car system for the Porsche 911 G-model.

After an inspiring presentation and an impressive factory tour, guests experienced the system live. With three valve positions, the focus isn’t on volume, but on delivering the perfect tone of voice: refined, deep, and unmistakably Porsche. A strong start to a promising collaboration.

about Porsche 911 G-Model

The Porsche 911 G-model represents the second generation of the legendary air-cooled 911 sports cars, produced between 1974 and 1989. It introduced key safety and design updates that solidified the unmistakable 911 silhouette and established the model as a global icon of enduring sports car engineering.

The Porsche 911 G-model was produced from 1974 to 1989 and featured an air-cooled flat-six engine ranging from 2.7 to 3.3 liters. It was available in Coupé, Targa, and Cabriolet body styles, offering versatility without compromising its iconic design. Over the years, it evolved through several important versions, including the 911 SC (1978–1983), the Carrera 3.2 (1984–1989), and the legendary 930 Turbo, each contributing to its status as one of the most respected sports cars ever built.

Technical specifications

 
Compatible modelsPorsche 911 G-model
Model years1974–1989
Engine2.7 / 3.0 / 3.2L flat-six.
Sound modes3
MaterialHigh-grade stainless steel
Header compatibilityOEM & aftermarket
Modifications requiredNone — plug & play
HomologationEU type approval
Warranty2-4 years

Stay up to date! WIN A FREE DR. JEKILL & MR. HYDE EXHAUST

Stay up to date with the latest developments of The Exhaust for the Porsche 911 G-Model and be part of the journey from the very beginning.

Sign up now for your chance to win a completely free Dr. Jekill & Mr. Hyde exhaust system during the official launch later this year. One winner will be selected when the system is officially released.

Be among the very first to experience the perfect balance of sound, technology, and emotion — engineered to bring the iconic Porsche flat-six to life like never before.

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