Dr. Jekill & Mr. Hyde King Wrinkle Black Adjustable Exhaust for Triumph Bonneville Speedmaster (2018-2020)

Dr. Jekill & Mr. Hyde King Wrinkle Black Adjustable Exhaust for Triumph Bonneville Speedmaster (2018-2020) [EP-142399]

The Dr. Jekill & Mr. Hyde King Wrinkle Black is an electronically adjustable slip-on exhaust made for the Triumph Bonneville Speedmaster (2018-2020). With a push of the handlebar button a valve inside the muffler closes, opens halfway or fully opens, giving you three sound modes: Dr. Jekill, Dynamic and Mr. Hyde.

It is street legal with European type approval (ECE, EG-BE and TÜV approved), its Smartbox reads the bike's CANBUS signals to keep every mode within legal limits, and it carries a 4 year warranty. Finish: Wrinkle Black. The same part number (EP-142399) also fits the Triumph Bonneville Bobber; we list it separately for each bike.

Key Specifications

How do the three sound modes work on the Speedmaster?

Press the mode switch on the handlebar to choose. In Dr. Jekill mode the valve stays closed for a quiet, mellow tone; Dynamic mode opens it halfway for a dynamic mid-tone; Mr. Hyde mode opens it fully for a deep bass sound. You pick the mode per situation, on the fly.

Is the King exhaust street legal?

Yes. Every Dr. Jekill & Mr. Hyde system contains a Smartbox, an electronic control unit that reads CANBUS signals from the motorcycle's ECU. Its software intervenes subtly and almost imperceptibly when the legal parameters are reached, so you stay street legal in all riding modes. The system is ECE, EG-BE and TÜV approved, and you receive a type approval card matching the number on your exhaust.

What makes the valve system reliable?

When you press the mode switch, the Smartbox signals servomotors that position the patented valve. Dual-cable operation lets them switch between closed, 50% open and fully open, and the servomotors use heavy duty cables with a 100% waterproof seal. The Exhaust is the result of German engineering and Dutch craftsmanship.

Does this part also fit the Triumph Bonneville Bobber?

Yes. Dr. Jekill & Mr. Hyde uses the same part number EP-142399 for the Triumph Bonneville Speedmaster and the Triumph Bonneville Bobber. This listing is for the Triumph Bonneville Speedmaster (2018-2020); message us with your exact bike and year to confirm before ordering.

Frequently Asked Questions

Will this exhaust fit my Triumph Bonneville Speedmaster?
This listing is for the Triumph Bonneville Speedmaster (2018-2020), part number EP-142399. The same part number is also listed for the Triumph Bonneville Bobber. Send your bike model and year on WhatsApp 9937059000 and we will confirm fitment before you order.

How long does delivery take in India?
Every exhaust is imported to order. Normal delivery is 4 to 5 weeks, and express delivery within 10 working days is available.

How do I switch between the sound modes?
With the weather-resistant mode switch on the handlebar, which flickers a red light when activated. Choose Dr. Jekill, Dynamic or Mr. Hyde mode while riding.

Do I need to remap my bike?
In most cases it is not necessary, but the brand advises checking with your dealer, especially if other non-original intake or fuel parts are fitted.

What warranty does it carry?
All new Dr. Jekill & Mr. Hyde exhaust systems come with a standard 4 year warranty.

Superbike Store stocks, fits and tests premium motorcycle parts for riders across India. For fitment advice or to order, WhatsApp us on 9937059000 or buy directly on the site.