Dr. Jekill & Mr. Hyde’s (J&H) novel exhaust system permits the rider to select from three completely different sound modes on the fly. An illuminated, handlebar-mounted change actuates a servo motor, which actuates a valve within the inside of the exhaust system to immediately modify sound output to your desire.
In Dr. Jekill Mode, the valve is closed, diverting the exhaust gases across the valve and thru perforations on aspect chambers of the exhaust, the place they cross by means of patented single-strand fiber dampening materials earlier than being routed out. That is the quietest mode, most intently resembling the inventory sound however with a a lot deeper tone.
A fast push of the button opens the valve midway for Dynamic Mode, which provides a particular low-frequency bark. A remaining push of the button unleashes Mr. Hyde Mode, by which the valve opens totally and the rider is handled to the engine’s full guttural roar as exhaust gases cross by means of comparatively unrestricted.
My BMW R 1250 GS exhaust system is ruled by an ECU that plugs instantly into the wiring harness, studying CANbus alerts from the bike and permitting the exhaust valve to energy on and off with the engine.
Associated: 2021 BMW R 1250 GS | Highway Check Evaluate
Set up of the J&H exhaust is simple. The small servo motor is mounted to the body above the header connection, and its waterproof management wires are routed alongside the within face of the muffler, the place an built-in clamp holds them securely. The wiring harness is plug and play. (J&H has a useful set up video on YouTube.)
As soon as put in, the J&H is a good-looking pipe. Its flawlessly completed Nomad Black physique results in a shiny hexagonal carbon fiber finish cap, punctuated by a stunning machined-aluminum accent plate on the rear. The inlet cowl is completed in matching shiny carbon fiber as properly. The looks is smooth, severe, and decidedly upmarket, drawing a great deal of consideration from fellow GS riders.
Out on the street, the BMW’s character may be immediately remodeled from delicate to wild relying on my temper, and I really like exercising that expression! Skilled readers are sensible sufficient to know the distinction between an annoyingly loud exhaust and an improved exhaust tone that matches with the character of every motorbike. This J&H pipe unleashed my bikes internal growl, including a wholesome dollop of welcome character to the machine.
However on this case, it’s not about quantity. Utilizing an AudioControl DMRTA calibrated decibel meter, putting the measurement system about 20 inches from the exhaust at a 45-degree angle per the SAE J2825 normal, I measured all three modes at idle: Dr. Jekill got here in at 85.9 dB, Dynamic measured 88.1 dB, and Mr. Hyde rang up 93.1 dB. For reference, SAE J2825 recommends a 92 dBA restrict at idle for bikes.
Dr. Jekill & Mr. Hyde exhausts are the very best of each worlds, permitting you to be naughty or good with out ever being obnoxious. They’re made within the Netherlands and are totally compliant with European emission legal guidelines. Testing is at the moment in progress for the U.S. market, and the corporate hopes to have CARB and EPA approval by the top of 2023.
MSRP for the BMW R 1250 GS Exhaust from Dr. Jekill and Mr. Hyde is $1,695 for black and $1,640 for silver. Every pipe is roofed by a four-year, unlimited-mile guarantee.