Sportster S Exhaust - Dr. Jekill & Mr. Hyde | Electronically adjustable exhaust for motorcycles | Best sound | Street legal

Sportster S exhaust

Harley-Davidson Sportster S - puts the 'sports' back in Sportster -Sportster S Exhaust

One of the most iconic Harley-Davidson models has been transformed into an unparalleled powerhouse that leaves the competition behind. The unique mix of modern design and classic elements, incorporating the Revolution Max 1250 engine, makes the Sportster S a machine to be reckoned with.

Dr. Jekill & Mr. Hyde has set itself the goal of developing an exhaust that does justice to this special motorcycle. Electronically adjustable and, like the Sportster S itself, equipped with the most modern technology. Brand new and yet with a touch of old school. We can't reveal much about this exhaust just yet, but we can already promise that you will be amazed.

We have been receiving many questions about our new exhaust system. We can assure you one thing: it is going to be awesome! That being said, for a unique bike like the Sportster S we only want to give you the best. The best sound, the best performance, in short; the premium product as you are used to from us. The bike and the engine are something different than we all are used to from Harley-Davidson and as most of you probably know by now; making a Dr. Jekill & Mr. Hyde exhaust is more than just putting an exhaust on the bike and twisting the throttle. 

To create a premium product there are many factors that need to be considered. Our team of skilled engineers is thoroughly working through all the steps to finally present you a product that will leave you in awe. Until then you have to be a little patient, but we promise you: it will be worth it!

Don't want to miss any updates from Dr. Jekill & Mr. Hyde for the Harley-Davidson Sportster S? Sign up for our dedicated newsletter and stay informed about the progress of this new exhaust.


Frequently asked questions



Pure joy borne from world-class engineering - we present to you the sound of the Dr. Jekill & Mr. Hyde exhaust for the Harley-Davidson Sportster S. A result of 25 years of experience  - distinct, iconic, and unmistakable Dr. Jekill and Mr. Hyde! 

Treat yourself with an impressive, top-of-the-line sound quality that shows the true identity of this sporty powerhouse. Through smart design Dr. Jekill & Mr. Hyde has created an electronically adjustable exhaust with three unique personalities, perfect for every single situation. All sound modes give the rider pure joy and freedom. Silent when appropriate, throaty and rumbling on request - at the push of a button.

How it sounds


Listen and enjoy the different sound modes of the Dr. Jekill & Mr. Hyde exhaust for the Sportster S. Seperate yourself from the outside world. Push a button to start.

Dr. Jekill Mode
Mr. Hyde mode
Dynamic mode

live events

Want to know where you can hear the Apex exhaust live? Check out our upcoming events and lets meet!


electronically adjustable exhaustDr. Jekill & Mr. Hyde | The Exhaust

The Jekill and Hyde Company gives motorcyclists the ultimate riding experience with The Exhaust. Our adjustable exhaust systems give you the possibility to adjust your sound to the moment and offers street legality, excellent performance, premium quality and 4 years warranty.

Dr. Jekill & Mr. Hyde | The Exhaust offers a completely street legal, premium quality exhaust with 4 years warranty. Our exhaust system makes it possible to choose between three different sound modes on the fly, which makes every ride spectacular! The Exhaust is a result of German engineering and Dutch craftsmanship. With state of the art technology, perfectly crafted by the best engineers in town. 

With computer simulations, the building of prototypes and extensive testing, we’ve created a tailor made exhaust for each and every bike. By riders, for riders.

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  • Dr. Jekill mode
  • Dynamic mode
  • Mr. Hyde mode

the valve the three sound modes

Our exhaust systems embody three distinct personalities: the Dr. Jekill mode, the dynamic mode and the Mr. Hyde mode. By a simple push of a button a valve inside the muffler closes, opens or opens halfway, giving your exhaust more power and performance. You can choose per situation whether you want to ride in the Dr. Jekill mode, dynamic mode or Mr. Hyde mode. It’s up to you.

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European type approval street legal

Dr. Jekill & Mr. Hyde | The Exhaust is a completely legal exhaust system that complies with European laws and is ECE, EG-BE and TÜV approved. The reason for this is that every Dr. Jekill & Mr. Hyde system contains a smartbox: this electronic control unit is the brain of the product and contains software that reads CANBUS signals coming from the motorcycle’s ECU.


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Only the best is good enough Premium Quality

Quality is one of our most important core values. Dr. Jekill & Mr. Hyde | The Exhaust does not only look great, it also needs to be a reliable and high quality product. All our exhaust systems need to withstand all kinds of extreme (weather)conditions and extreme heat. Therefore they are thoroughly tested, before going into production.

When all the tests are passed and an exhaust becomes available to the public, only the highest quality materials are used for the production which are all sourced from trusted suppliers in Europe.


this is why
Riders love us

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"Legal, but still a beautiful deep Harley sound."
Harley Dutchies  |   Harley-Davidson Sportster

"I got to know Dr. Jekill & Mr. Hyde at a motorcycle fair. I was impressed by this exhaust system from the first moment. But after a test drive I was sold. Wonderful to drive being able to play with the sound. The fact that it is legal, but still gives a beautiful deep Harley sound was the deciding factor in choosing Dr. Jekill & Mr. Hyde and they are also beautiful under my bike, also not unimportant. My bike passed the strict RDW inspection and I can confidently cross the (German) border without worrying. "

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"Thank you for this simply ingenious exhaust system."
André (@Bluebobber48)  |   Harley-Davidson Sportster

"I will never forget the moment when my 48 was brought home to me and I pressed the button for the first time. There was an incomparable, bassy sound, as it should be for a Harley. An absolute dream for every Harley rider. For me it is optically and technically by far the best system on the market and I would buy it again 100%. The look is perfect and the riding pleasure is absolutely unique. Thank you for this simply ingenious exhaust system."

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"Legal with perfect sound."
Sascha Koerner  |   Harley-Davidson Fat Boy

"Just WOW! I've had a motorcycle license since I was 18, but I've never bought a bike. My dream was to buy myself a Harley by the age of 40, but it didn't quite work out. But shortly before my 41st I did. The Dr. Jekill & Mr. Hyde system simply rounds it off, it is pure riding pleasure when you are out and about in Mr. Hyde mode. That's how a Harley has to breathe. Just yesterday, I rode to a gas station, and when I came out again, my bike was being inspected by another Harley rider. I just said, can I help? His answer: just wanted to see what you're riding, it sounds mega, I got to have it. I can just say thank you! Legal with perfect sound."

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"There's a night mode for those who come home late at night ;-)"
Martin Wyss  |   Breakout

"I've never regretted the decision to go with the Dr. Jekill & Mr. Hyde system and I look forward to every trip with the beautiful, deep and powerful sound. There's a night mode for those who come home late at night ;-) "

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"Goosebumps guaranteed!"
Christopher Falk  |   Sportster

"Incredibly beautiful sound! Goosebumps guaranteed, even when you start the second/third/fourth time!"

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"I feel like I'm the king of the streets."
@mawi_davidson  |   Harley-Davidson Sportster Forty-Eight

"When I ride with my motorcycle I feel free. And when I ride with my Dr. Jekill & Mr. Hyde exhaust I feel like I'm the king of the streets. And when everybody looks at me and give me a thumbs up I know I made the right decision choosing this exhaust system."

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"Roaring sound and pure performance!"
Walter Wais  |   Harley-Davidson Sportster

"Dr. Jekill & Mr. Hyde is the best investment in my bike so far!!! It adds 100% more driving fun. I can adjust the volume according to my needs, and at the push of a button a roaring sound and pure performance. And the best of all it's street legal. Many thanks to the Dr. Jekill & Mr. Hyde Team - great job keep it up!"

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"When so many beautiful things happen to you, that's worth 5 stars plus..."
Christian Sharkey Scherkenbach  |   Heritage

"When the sound hits you in the stomach, the ground trembles under your feet and a broad grin adorns your face, then for the first time you have pressed the button on your new Dr. Jekill & Mr Hyde exhaust system. When so many beautiful things happen to you, that's worth 5 stars plus..."

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"100% legal and yet the full Harley sound."
@strandfahrer  |   Harley-Davidson Street Bob

"So, What I particularly like about the Dr. Jekill & Mr. Hyde exhaust is the deep sound, the quality and that the valve is inside the silencer. I also think it's great that you can change the look of the exhaust afterwards by replacing the end caps. 100% legal and yet the full Harley sound is absolutely great, especially in Germany."

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"A must-have on your bike!"
Thomas Peerlinck  |   Harley-Davidson Streetbob

"I have my Dr. Jekill & Mr. Hyde exhaust for one year now, 6.500 km on the 2019 Street Bob 107ci stage I with S&S teardrop intake... and VERY HAPPY! Amazing sound, deep, dark and loud, but quiet when necessary (neighbours, city center, horses or small kids around...) all this legal with certificate. This head-turing piece of art is a must-have on your bike!!"

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"Choose your own style."
@marc_stone82  |   Harley-Davidson Sportster Forty-Eight

"If you are looking for a high quality and exactly finished exhaust system which can be modified to your own style you have to choose Dr. Jekill & Mr. Hyde! On top you also get the possibility to change your sound levels easily by a push of a button."

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"I am a person with emotion - the sound of the motorcycle has to be top notch."
Frank Schelper  |   Harley-Davidson Breakout

"I've hesitated for a long time to buy a Dr. Jekill & Mr. Hyde exhaust system. This year I finally got the heart to configure and order the exhaust system according to my wishes. After the exhaust system was mounted on my Harley-Davidson Breakout and I picked up the machine, and I was fascinated by the sound after the first 5 km. I haven't regretted my decision since. It's also a wonderful feeling not to be out on the road with an illegal exhaust system anymore. I will continue to enjoy the sound in my ears every mile. This is another reason for me never to buy an electric motorcycle, athough I am convinced that electric motorcycles also have a certain charm. But unfortunately I am a person with emotion - the sound of the motorcycle has to be top notch."

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"An experience for my ears and soul!"
Andreas "Harley-Sportster-Lifestyle"  |   Harley-Davidson Sportster

"It's just awesome I can ride my bike to work at 5 a.m., without getting into trouble with the neighbors! But when I'm on the open road, press the button on the handlebars and the valve in the muffler opens, the show begins! The best sound you can imagine, bassy, muffled, every meter I ride becomes an experience for my ears and soul! Without worrying about a traffic control! I can only recommend: get a system, it is worth every penny."

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"No comparison to the original sound."
Andrej  |   Harley-Davidson Sportster

"Just awesome, no comparison to the original sound. I would never go without a Jekill again."

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"Perfect finish and street legal."
Martin Brunner  |   Harley-Davidson Fat Boy

"Very good exhaust system - perfect finish and street legal. And Smartbox 2 is awesome!"

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"This is the best upgrade you can do on your bike."
Gerco Goote  |   Road King Special

" Today was my first ride on my Road King Special with the J&H exhaust. What a revelation. It felt like a brake had come off the bike and the sound is magnificent. This is the best upgrade you can do on your bike. My bike is Euro 5 and there it still works. The sound of the Mr. Hyde mode is warm and dark. The looks are also great. This exhaust is just what you need on your bike."

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"The unique powerful sound I was looking for."
@dysnrider  |   Harley-Davidson Sportster

"Dr. Jekill & Mr. Hyde offers the unique powerful Harley sound I was looking for. Which is more bassy, but still civil enough for daily rides. Even the possibility of adjusting the valves with just a push of a button is very comfortable on longer tours. You get something for the price and it's worth it."

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"The sound is really perfect!"
Stefan S  |   Harley-Davidson Fat Bob

"I have installed my second J&H system, first on my HD Custom and since 2018 on my HD FatBob BJ 2018. What can I say, the sound is really perfect, not too loud, but also not too quiet, a bass tone, that fits the bike perfectly. I also looked and listened to other manufacturers, but then decided in favor of J&H. The advice and after sales service at J&H is great and I personally recommend all my biker friends to buy from you! The BEST! "

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"Dr. Jekill & Mr. Hyde makes the hair on the neck stand up."
Sportster Forty-Eight Icon  |   Harley-Davidson Sportster

"When I bought a Harley Davidson Sportster Forty-Eight, it quickly became clear to me that I had to replace the exhaust system. Of course, only one exhaust system was an option for me. The quality, optics and of course the sound of the Dr. Jekill & Mr. Hyde is simply unique on the market and all of this is still 100% legal. I would also like to highlight the great selection of end caps at this point, which allow each customer to customize. The change from the original system to the Dr. Jekill & Mr. Hyde exhaust system, transformed my Harley's sound from a lawnmower into a black beast. As soon as the infamous button is pressed, the hair on the neck stands up. Emotions and moments of happiness that Dr. Jekill & Mr. Hyde gives every motorcycle rider with their products. "

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"This is exactly what a Harley-Davidson should sound like!"
Alessandro Silverfox  |   Harley-Davidson Sportster Iron 1200

"From my point of view the best sound by far. This is exactly what a Harley-Davidson should sound like, nice and bassy. The Dr. Jekill & Mr. Hyde increases the driving pleasure by 100% and if you want to be a little gentler on the road, you always have the option to choose between the 3 levels. In addition, the quality and service are unbeatable, in my opinion the BEST system on the market. I don't want to be without them on any machine and would recommend them anytime."

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"I can't get the grin off my face anymore!"
Stefan Senkfell  |   Harley-Davidson Fat Boy

"The best decision I've ever made to have this mega exhaust fitted! There is simply NOTHING BETTER !!! Should be standard on every Harley - I can't get the grin off my face anymore!"


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All images used on this page are for illustrative purposes only and may not be an exact representation of the product or possible product combinations.


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frequently asked questionsFAQ

What will be the price of the Apex exhaust for the Sportster S?
At this moment the development of the Apex exhaust is still ongoing, so the exact pricing is not determined. You will be the first to know if the price is set.

When will the Apex exhaust be available for (pre-)order?

Dr. Jekill & Mr. Hyde’s goal is to release the pre-orders asap. We expect to deliver the first Apex exhausts this year.

Which configurations of the Apex exhaust will be available?
The design of the Apex exhaust is final and is like the pictures on this page. The finishes are not final yet and can change. Our goal is to make a configurable exhaust in brushed and black with a streetfighter and a slashcut endcap in blank, black and bronze.

Can we hear the sound of the Apex exhaust for Sportster S?
Sound files are available here and Instagram. The intensity of the sound is difficult to capture via a microphone, but you get a good idea of the sound color and tone. In the next weeks / months we will show our concept system on several shows (check out all events).

Is the Apex exhaust legal?

Like all Dr. Jekill & Mr. Hyde products the Apex exhaust will be street legal with Euro 5 approval.

Is the Apex exhaust electronically adjustable?
The Apex exhaust will be available exclusively as an electronically adjustable exhaust with three sound modes.