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'twenty-one'
2in1 exhaust
Your riding style might get you in trouble, your exhaust won't
* Please Note: Some images may show additional exhaust configurations, colors & options.
View all options available for this exhaust using our Exhaust Configurator Tool.
Thumbnail Filmstrip of Twenty-One Streetfighter Brushed Stainless Steel/Aluminium 21 Full Forward Narrow Brushed headerset Images
DESCRIPTION
Harley-Davidson Low Rider S & Lowrider ST Exhaust // Twenty-One with Streetfighter End Cap
Dr. Jekill & Mr. Hyde® for
the Harley-Davidson Lowrider S & Lowrider ST
(2022 - 2024) models.
Clubstyle Redefined with the New Twenty-One 2-into-1 Exhaust in Brushed Steel by Dr. Jekill & Mr. Hyde®
Crafted exclusively for the Harley-Davidson Lowrider S & Lowrider ST models from 2022 to 2024, the Twenty-One in Brushed Stainless Steel with a Streetfighter end cap in Aluminum is the ultimate performance upgrade. This complete package includes the exhaust and a matching set of headers in Brushed Steel, engineered for full forward foot controls. Riders can explore additional customization options, including finishes in Wrinkle Black and mid-control configurations for headers, using our Exhaust Configurator.
Performance Meets Innovation
The Twenty-One 2-into-1 exhaust by Dr. Jekill & Mr. Hyde® embodies the spirit of the clubstyle/performance scene. Its raw, stripped-down design complements the Harley-Davidson Low Rider S while delivering a bold performance edge. This electronically adjustable exhaust gives you complete control over your ride’s sound, blending cutting-edge technology with iconic Harley style.
Tailor Your Sound with 3 Dynamic Modes:
Dr. Jekill & Mr. Hyde®'s electronically adjustable sound modes let you match your exhaust note to any riding moment:
- Dr. Jekill Mode: A calm, understated tone perfect for city cruising or early departures, keeping the valve closed for a refined and discreet sound.
- Dynamic Mode: A balanced growl that accentuates the Low Rider S’s character, with the valve half-open to deliver an assertive yet composed exhaust note.
- Mr. Hyde Mode: Unleash the full power of the Low Rider S with an open valve that roars with intensity, providing an adrenaline-fueled soundtrack for the open road.
Fitment for: Harley-Davidson Lowrider S and Lowrider ST (2022-2024) models.
Finish Options: Shown here in Brushed Stainless Steel with a Streetfighter end cap in Aluminum. Use our Exhaust Configurator to explore additional finishes available include Wrinkle Black for both the exhaust and headers, along with a choice of Big Shot, Slashcut, or Streetfighter end caps in Wrinkle Black, Aluminum, or Bronze.
Header Configuration: Shown with Brushed Steel headers for full forward foot controls. Mid-control configurations are also available.
Sound Quality: The Twenty-One has been meticulously engineered and sound-tuned to offer unparalleled auditory performance, creating a soundscape that matches the Low Rider S’s rugged persona.
Warranty Assurance: Backed by Dr. Jekill & Mr. Hyde®’s trusted 4-year warranty.
Premium Construction: Designed with high-quality materials for durability, style, and performance that last, complementing the aggressive aesthetics of the Low Rider S.
Elevate your Harley-Davidson Low Rider S with the new Twenty-One 2-into-1 exhaust system in Brushed Steel—blending innovation, style, and performance for an unparalleled riding experience.
Explore the Sound Experience of the 'Twenty-One'
Immerse yourself in the unique sound of the 'Twenty-One' that elevates the power of the M8 engine to unprecedented heights. Experience the thrill of riding with a heightened feedback from your exhaust, encouraging you to push your bike a little further. The exhaust has undergone rigorous sound tests to deliver this perfect auditory experience, ensuring every ride becomes a symphony of power and precision.
THE LOOKS
Opt for the Twenty-One, and you'll receive a complete exhaust system featuring a header set and muffler. While our other Dr. Jekill & Mr. Hyde® exhausts boast a clean design, the Twenty-One stands out with a rugged and unpolished appearance, showcasing visible welds and a natural discoloration over time. This system is not only lighter than standard exhausts but also provides optimal ground clearance for a comfortable lean in the bends. Despite its raw aesthetic, the Twenty-One maintains the quality synonymous with Dr. Jekill & Mr. Hyde® products.
PERFORMANCE
Tailored for the clubstyle rider, performance takes center stage in the development of the Twenty-One exhaust. Compliant with legal standards, the Twenty-One substantially enhances your bike's performance. The exhaust's design eliminates performance loss when riding with a closed valve, ensuring a safe and smooth experience, regardless of the mode you choose.
GOING CLUBSTYLE
Harley-Davidson, deeply rooted in tradition, stands as a brand defined by its enduring pillars. The iconic chopper, effortlessly cruising down the American Highway, has become a timeless image etched into our collective consciousness. However, as with any tradition, there arises a shift in perspective, challenging its long-standing validity.
Emerging from the motorcycle club culture, where bikers navigated extensive distances, a movement took shape—shifting the focus from customizing Harley looks to optimizing performance. Modifications were directed at making bikes faster, more manageable, and agile enough to conquer corners with knees brushing the ground. Originating with the FXR, evolving through the Dyna, and seamlessly integrating into the latest Softails.
Clubstyle has become an undeniable force in today's Harley scene. For Dr. Jekill & Mr. Hyde®, it was a natural progression to craft an exhaust specifically tailored for this dynamic movement. Collaborating with esteemed partners from the clubstyle & performance scene, we initiated Project 21: the creation of the ultimate electronically adjustable clubstyle/performance 2-in-1 exhaust!
Tailor-Made Options
The Twenty-One offers a range of customization possibilities. Opt for a black or brushed edition for both the muffler and header set, and choose from a variety of end cap options – slashcut or streetfighter, available in black, aluminum, or bronze. Take it a step further by selecting between a full cover of shields or a more minimal cover for the header sets. Explore our exhaust configurator to discover the design that suits you best.
TESTIMONIALS
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Theodore (Chicagoland) | November 23rd, 2024
Just ordered my second Jekill. First for a R9T 100 Yr Edition and now for a R1250 GS 40 Yr Edition. Great product!
Mauricio Romero Mendoza (Dallas Texas USA) | November 12th, 2024
I really love this piece nice looking exhaust. What I like more is the 3 different sounds amazing with a touch of the switch highly recommend also great customer service they did answer all my questions via email thanks
timothy | October 21st, 2024
i LOVE THE HYED A EXHAUST ON MY 2024 1300GS
dianna simmons (Centerton Arkansas) | September 22nd, 2024
this is my second purchase for my other Harley. I will be running Jekill & Hyde for all of my motorcycles.
VINCE (NEW YORK) | September 17th, 2024
The gentlemen I spoke with went above and beyond for me making sure I get the right exhaust on my bike.
Ive purchased already two other exhaust systems from other manufactuers and once received they were either wrong or missing items. Feel extremely excited for this one feel big man upstairs deterred me from those to do things right the first time and purchase this exhaust here. thank you fellas!
Kasey James Kadrmas (Florida) | September 5th, 2024
I spent ages doing research on the perfect exhaust for sound and looks. This is THE one by far! I Love it!!!
Guillermo (México) | September 2nd, 2024
Great sound. The ajustable valve is really helpfull when you want to reduce noise. Engine feels 20% cooler.
Tom Edwards (Wisconsin) | August 16th, 2024
that was the easiest way to order so far.
David Peloubet (Fort Worth Texas USA) | July 16th, 2024
Great product. Works great. I am disappointed that a custom made product doesn’t have the logo mounted where they square up together with street. Both face down at the street
brad h mengel (pennsylvania, USA) | July 14th, 2024
I just ordered Nomad exhaust for a HD PanAmerica, can't comment on the exhaust itself yet but being able to order it online direct to myself and use PayPal to complete the purchase was super nice.
Eddy (Longueuil, Québec) | July 12th, 2024
A little pricy but Great Quality and fast shipping...
Wayne H. Crotty (Jasper, Fl) | July 4th, 2024
The ability to turn on and off the rumble is surprisingly impressive!! Thanks for making my 23 CVO a Harley!!
Nate McElhaney (Florida) | June 5th, 2024
I bought a new Harley and they set me up with the correct wiring for transferring the pipes to the new bike. I love how I can ride loud or softer for my daughter.
Robert Dépatie (Montreal canada) | June 1st, 2024
Web site is great
David Greene | May 24th, 2024
Wow. Love this exhaust system. first of all the sound when it’s in the rumble mode is perfect. People know when your coming and heads turn and try and get a look at what your riding. Then you pull up next to them hit the button and the next second your bike goes into docile mode. But I have to say the quality is absolutely the apex of engineering. I put the system in myself and it took about an hour and half. The video on the internet walks you right through it. The manual that comes with it is one of the first ones that actually spells it out simply. I worked with Chris on getting it delivered to me and they couldn’t be any nicer but actually extremely knowledgeably about what they are selling. I would highly recommend this product to anybody who wants the best system on the market. David
Rick (San Diego) | May 23rd, 2024
timely email responses and easy ordering and payment process without issue.
Pieter Hartog (Costa Rica) | May 13th, 2024
I installed my J*H exhausts back in 2015 on my HD Softail Classic Heritage. After almost ten years driving in tropical conditions one of the servomotors failed. After on-line consultation with the factory it was recommended to rather change both servomotors. Same were ordered on-line and arrived without problems in Costa Rica and have in the meantime been installed. Excellent customer service & after sales service and will continue to support this brand for many years to come
Keith (Lowell, MA, USA) | May 10th, 2024
These pipes truly live up to their name, going from loud to stealth with push of a button. Highly recommend!
Matthew (Dallas TX) | May 1st, 2024
From the moment the Jekill and Hyde exhaust arrived, I knew I was in for a treat. The packaging alone set a high standard—pristine condition with an impressive presentation that promises quality. The contents inside did not disappoint. The installation process was a breeze; the instructions were as clear and straightforward as assembling a set of Legos, which speaks volumes about Jekill and Hyde's commitment to customer satisfaction.
The true joy came with the first roar of my Triumph Speedmaster after installation. The sound is absolutely fantastic—deep, rich, and exactly what I was looking for. It's clear that Jekill and Hyde take immense pride in their craftsmanship, and it resonates with every rev of the engine. I'm thoroughly pleased with this purchase and I'm certain that my future bikes will be equipped with Jekill and Hyde exhausts too. For anyone looking to enhance their motorcycle's performance and sound, this product is a definite must-buy, you will not regret it!
Jason Blackburn (Massachusetts) | April 30th, 2024
Excellent craftsmanship!
Installed on a 2024 Fatboy 114. This exhaust is by far the best sounding exhaust when in Hyde mode. I’ve listened to every exhaust and have owned several. This one sounds angry in Hyde mode.
Dynamic mode sounds real nice too. Great when you want to relax or take the lady on a nice ride.
Jekyll mode is good for neighbors you don’t want to aggravate BUT like I said put it in Hyde mode and bike sounds like a beast :)
Ascetically, the exhaust looks great on the Fatboy as well.
Great customer service too, I reached out to them to work with my Harley Dealer and they shipped it to them for the install.
Tomas (Atlanta, GA) | April 25th, 2024
Simply amazed at how this J&H exhaust system drastically changes the character of this motorcycle. Super impressed and happy with my purchase.
John (Florida) | April 25th, 2024
Simply the best all around sounding and functional exhaust system on the market, have them installed on all of my bikes!
Jack | April 23rd, 2024
I stand by the Exhaust from J&H as a domestic peacemaker. This will be my third. It works exactly as advertised, and I have been a completely satisfied customer. It all depends on what you are trying to achieve, of course, but if your ultimate goal is stealth when appropriate and a roar when unconstrained, then this is the exhaust for you.
Mike (District Harley Davidson) | April 17th, 2024
Great company from our first contact all the way through the delivery and packaging of the product. The customer is thrilled with the system and has no worries in taking his bike back to his country where they are very strict on sound compliance.
Texoma (Sherman, Texas) | April 2nd, 2024
keep it up
Gene (Greenville SC.) | March 15th, 2024
The sound of this exhuast wasvery good. I visitedthe both at Daytona. I am waiting to hear them on my bike.
Rickey (HAMPTON ROADS HARLEY-DAVIDSON YORKTOWN VA) | March 7th, 2024
awesome customer service
Hoff (Saint Louis, MO - USA) | February 5th, 2024
My Indian Pursuit isn't just a commuter, it's a long-distance companion. Looking back, the only regret I have is not outfitting it with the Jekyll & Hyde exhaust system sooner! Believe me, it's a game-changer.
From the initial contact with Chris in Hendersonville to the moment I roared out of town, the entire experience was exceptional. Chris answered all my questions promptly and expertly, making the decision a breeze. Installation was seamless – my local dealer paired it with a Stage 2 engine upgrade, and the technician couldn't stop grinning when I asked if it was ready. "You're gonna love it," he assured me, clearly as impressed as I was. (Apparently, it was their first J&H install, and they were having a blast with it!)
Part of the reason I chose Indian was the stock exhaust's low rumble, perfect for cruising through quiet neighborhoods. But the option to unleash some beastly roar was too tempting to pass up. Let me tell you, I have zero regrets! Every time I hit that button, the subdued purr transforms into a chest-thumping, low-frequency rumble that puts a giant grin on my face. It's the ultimate Jekill & Hyde experience – switching from stealthy cruiser to attention-grabbing machine in a heartbeat. This company lives up to its name in the best way possible!
Sebastian (argentina) | January 23rd, 2024
Excelent platform, very fast and reliable to buy from you, astonishing products!
Andrew (Canada) | November 28th, 2023
They found a system for my bike event tho it was older and not listed on there web site anymore. Very easy to deal with
Dealer (Power Motorcycles USA (Palm Bay, FL)) | October 13th, 2023
Accessorize your bike with an exhaust that fits all your needs. No longer do you have to wake up the neighborhood with that new exhaust or be that guy with the "sewing machine" sounding exhaust.
Al | October 10th, 2023
A very exciting exhaust product!!
Jeremiah Schiessel (Detroit,MI) | September 20th, 2023
First off, other than the awesome fact that you can control the exhaust to be quiet or loud, the performance of my bike (Sportster S) is convincingly better. It is almost as if the exhaust has added a new mode between road mode and sport mode. Acceleration feels more sporty and responsive (similar to sport mode) but while still in road mode than with the stock exhaust. I wish I had got before and after install dyno numbers. The look is awesome!! When it arrived I was so impressed with the level of care and detail to packing this thing I felt bad removing it from the box. Installing it is easy if you have a basic mechanical aptitude. I am truly impressed and it is the crown jewell of the bike for sure.
Gabriel Godin (Sudbury Ontario Canada) | August 30th, 2023
Very satisfied. Fast shipping 7 days door to door from Netherlands. Product as described and easy install. Jekyll mode similar to stock but Hyde rumble is sweet!
Scott (Utah) | August 17th, 2023
Although the install wasn't difficult I needed a replacement part, they were easy to work with and sent the part quickly. The service was great!
Dubé Paul (Montréal Canada) | August 14th, 2023
Very professionals services
I recommend them all the way!
HOW IT SOUNDS
ELECTRONICALLY ADJUSTABLE EXHAUST
ADJUST YOUR SOUND TO THE MOMENT
Experience motorcycling like never before with The Exhaust from the Dr. Jekill & Mr. Hyde® Company. This electronically adjustable exhaust system offers riders the unique ability to tailor their sound experience, providing excellent performance, premium quality, and an extensive four-year warranty.
Dr. Jekill & Mr. Hyde® | The Exhaust delivers a top-tier exhaust with a four-year warranty, ensuring riders enjoy peace of mind with their purchase. The cutting-edge exhaust system allows riders to seamlessly switch between three distinct sound modes, enhancing every ride.
The result of German engineering and Dutch craftsmanship, The Exhaust embodies state-of-the-art technology meticulously crafted by seasoned engineers. Utilizing computer simulations, prototype building, and rigorous testing, Dr. Jekill & Mr. Hyde® have curated a bespoke exhaust for each motorcycle, showcasing a product created by riders for riders.
Adjust your sound to the moment with three sound modes
Dr. Jekill & Mr. Hyde® systems feature three distinctive personalities*: the Dr. Jekill mode, the Dynamic mode, and the Mr. Hyde mode. With a straightforward push of a button, a valve within the muffler seamlessly closes, opens, or partially opens, enhancing your exhaust's power and sound. This intuitive design equips riders with the flexibility to customize their sound experience according to the moment.
HD SOFTAIL SOUNDCHECK
USE YOUR HEADPHONES FOR THE ULTIMATE EXPERIENCE
Listen and enjoy the three different sound modes of the Dr. Jekill & Mr. Hyde - The Exhaust.
Mr. Hyde
Mr. Hyde Mode - The exhaust boosts a beautiful, deep rumble.
Dynamic
Dynamic Mode - A tamed Mr. Hyde sound.
Dr. Jekill
Dr. Jekill Mode - A calm, low-key but distinctive sound.
At Dr. Jekill & Mr. Hyde®, our sound engineers have meticulously tuned the exhaust tones to harmonize seamlessly with the unique character of the Harley-Davidson's engine across all sound modes. We take genuine pride in the remarkable sound quality and craftsmanship embodied in every Dr. Jekill & Mr. Hyde® Exhaust. The engine's power finds its ideal expression in the resonant and distinctive tones emanating from our exhaust system.
WARRANTY
4 year warranty
At Dr. Jekill & Mr. Hyde®, we take pride in the quality and durability of our products. Our exhausts are crafted to endure, designed and manufactured with longevity as a priority. Hence, we provide all new exhaust systems with a standard 4-year warranty.
For a precise understanding of the Dr. Jekill & Mr. Hyde® warranty terms, we encourage you to thoroughly review the warranty terms. Enjoy your exhaust with peace of mind.
VIDEO
FITMENT
| BRAND | FAMILY | MODEL | YEAR |
|---|---|---|---|
| Harley-Davidson | Cruiser | Lowrider S (FXLRS) with Full Mid Narrow Foot Controls | 2022-2024 |
| Harley-Davidson | Cruiser | Lowrider ST (FXLRST) with Full Mid Narrow Foot Controls | 2022-2024 |