Dr. Jekill & Mr Hyde Adjustable Exhaust Systems - Jekill & Hyde Exhaust systems, Jekill and Hyde Exhaust Systems for Harley Davidson Motorcycles and Custom Motorcycles

Dr. Jekill & Mr. Hyde Electronically Adjustable Exhaust Systems. Made in the Netherlands. Covered by European & US patents.
The Jekill & Hyde Company has developed an electronically adjustable exhaust system that lets the driver choose between a stock Harley-Davidson sound,  and the world famous Harley-Davidson (louder) Rumble. The muffler contains an electronically adjustable butterfly valve. When the valve is closed,  the motorcycle produces about 85 db and gives out the same HP as the OEM mufflers. When you open the valve you not only gain about 15 % more  horsepower, but you also get up to 130db of deep thundering sound. The  noise control is not just as a result of either blocking or unblocking the escape of exhaust gases. When the valve is closed exhaust gas is diverted through a more restrictive passage inside the muffler. When the valve is open  the muffler becomes a straight through type muffler with a resulting deeper  and louder sound. You effectively have two different mufflers within the single  muffler body. Electronically adjustable exhaust systems are produced for all Harley Davidson models from 1984 up to 2007.
The internals of all units are 100% stainless steel. Only the highest quality materials available together with the best workmanship are used in these products which allows them to give customers  a two year full warranty on their electronically adjustable Dr Jekill & Mr Hyde exhaust system.              Installation Information
Mufflers have a universal mounting bracket that fits nearly  all H-D models. On some specific ones you only need to make a  small adjustment. Fitting advice available prior to purchase

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Shorty Exhaust for Harley Davidson Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

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Short and fast! Specially tuned direct low sound.

Length 410 mm
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Shorty Big Shot Exhaust for Harley Davidson Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Shorty Big Shot Exhaust for Harley Davidson Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

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One of Dr Jekill & Mr Hydes coolest exhaust systems!
"The bigger the hole, the better the sound!"
Length 430 mm,
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Shorty Tapered Exhaust for Harley Davidson for Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Shorty Tapered Exhaust for Harley Davidson for Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

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Wanna have a Jekill & Hyde with the original Harley look?
Then this tapered exhaust system is just right for you.

Length 500 mm
Connection width 1¾ Inch
Size meets the original Harley Davidson mufflers

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Exhaust for Harley Davidson Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

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Length 470 mm
Connection width 1¾ Inch
Available in Chrome plated, Cobra black ceramic and black chrome
One of our most popular exhaust systems

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Bigshot Exhaust for Harley Davidson Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Bigshot Exhaust for Harley Davidson Dyna, Fat Boy, FXD, FXR, Heritage, Rocker, Softail FX - FL and Sportster

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60 mm longer than the Jekill & Hyde "Shorty"
Makes it sound a bit less direct.

Length 490 mm
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Fat Bob Exhaust System for Harley Davidson Fat Bob

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Specially made for the Harley Davidson Fat Bob, this exhaust looks like the original one but of course
sounds so much better because of the "big black hole" and the intelligent system inside.

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Thunderbolt Super Shorty Fat Boy, Heritage and Softail FX - FL

Set includes Supershorty exhausts and headerpipes
Available in Stainless steel high polish finish or black ceramic coating finish.
Also available as straight and upswept exhaust.
Available for custom builds also, for example:
Harley Davidson, Saxon and Titan

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Thunderbolt Supertrapp for Fat Boy, Heritage and Softail FX - FL

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Largo Exhaust for Harley Davidson FLH - Evo Series, Rocker and Springer

Length 640 mm
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Instruction manual

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Largo Big Shot Exhaust for Harley Davidson FLH - Evo Series, Rocker and Springer

Long and elegant design, tuned to give you a deep roaring sound!

Length 680 mm
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Largo Fishtail for Harley Davidson FLH - Evo Series, Rocker and Springer

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Length 830 mm
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Instruction manual

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Streetfighter Largo Tapered Exhaust for Harley Davidson FLH - Evo Series, Rocker and Springer

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Picture 1

Length 760 mm
Connection width 1¾ Inch
Chrome Plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Instruction manual

Select your choice from the drop down list below and click 'Check Price'.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Black Big Shot Exhaust for Harley Davidson FLH Twin Cam Series

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Classic Big Shot with black ceramic coated endcaps.

Fits beautifully on the Ultra Glide, Electra Glide and Roadking.
Length 680 mm
Connection width 1¾ Inch
Chrome Plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with lifetime warranty!
Connection cables
Instruction manual

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Classic Big Shot Exhaust for Harley Davidson FLH Twin Cam Series

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Big and beautiful!
And loud of course, but only if you want it to.
Fits beautifully on the Ultra Glide, Electra Glide and Roadking.

Length 680 mm
Connection width 1¾ Inch
Chrome Plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Instruction manual

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Classic Fishtail Exhaust for FLH Twin Cam Series

Click the links below for more pictures

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The classic exhaust system, now available with the Jekill & Hyde adjustable system inside.

Length 830 mm
Connection width 1¾ Inch
Chrome plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Classic Tapered Exhaust for Harley Davidson FLH Twin Cam Series

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Picture 1

Wanna have a Jekill & Hyde with the original Harley look?
Then this tapered exhaust system is just right for you.

Length 760 mm
Connection width 1¾ Inch
Chrome Plated

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Hot Rod Exhaust for Harley Davidson Night Rod Special

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Supershort! Only 300 mm
Nasty look, brutal sound!
Black ceramic coating finish

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with lifetime warranty!
Connection cables
Assembly instructions

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Nightrod Special Exhaust for Harley Davidson Nightrod Special

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This Jekill & Hyde black exhaust system makes the Night rod Special look even better.
Also available as 30 cm ultra short Hot rod.

Length 385 mm
Black ceramic coating finish

Exhaust systems comes with :

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Instruction manual

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Hotrod Exhaust for Harley Davidson V-Rod

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Super short exhaust system with Jekill & Hyde inside.
Length only 300 mm!
Chrome Plated finish.

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Restyling Project Exhaust for Harley Davidson V-Rod

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The Jekill & Hyde Company restyles your original V-Rod exhaust with J&H adjustable exhaust units “inside”.
The advantage is that the style of your V-Rod stays the same but the sound of the exhaust is electronically
adjustable from standard to approx. 130 dBa !
The Jekill & Hyde Company usually has a restyled V-Rod exhaust set in stock which makes it possible to
get a Dr. Jekill & Mr. Hyde version installed on the spot.

Dr Jekill & Mr Hyde Electronically Adjustable Exhaust Systems - Dr Jekill & Mr Hyde Hot Rod Big Shot Exhaust for Harley Davidson V-Rod

Super short exhaust system with Jekill & Hyde inside.

Chrome plated finish.

This exhaust system comes with:

Servo control unit (J & H BlackBox)
Servo motor
Inside Cable
Special heat resistant cable with a lifetime warranty!
Connection cables
Assembly instructions

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