I have been in contact with The Jekill & Hyde company about their electronically adjustable valve system exhaust which the sound can vary from a 79 db quite to warm deep rumble(rumble hell I want it to sound like a porch on steroids).
The new model that they have developed for the GL1800 & F6B supposedly has no power loss and same back pressure closed as OEM (Dr. Jekill) while a higher hp output and torque with the valve open (Mr. Hyde). No re-tuning or Dyno needed, at this time I have no specs to verify any of this.

Once I got a hold of the USA representative Stefano Bertani things have moved quite fast.
Stefano sent me these tad blury when enlarged pic of a red F6B that they had just installed their system on in Reno NV last weekend.

Sorry no sound clip yet and as you can see in one of the pic the bike still has the seat & side cover off. I was also sent a pdf file of the install instructions(looks as easy as installing the HeliBars).

I was assured they were a direct fit to the OEM headers or in my case Torque Loopz. Cost is $1950 shipped to you or a dealer of your choice, they come with a 2 year warranty. http://jekillandhyde.com/en_global/aboutus
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Well, never let it be said BIGLRY doesn't step into uncharted waters as I just pulled the trigger on a set in black with the black 360 deg. rotatable slash end caps, expected delivery is 7-14 days.
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I will be doing my usual review and opinion with pic of the install and hopefully a good sound clip if I can figure out how to do posted on the board. As some of you know that had or have the VTX1800 I'm the guy who did the original smog removal wright up with pic and many more detailed post about the VTX. I pride myself by taking great care in attention to detail and any helpful tips I find along the way will be passed along.

In summery, I had no intention of changing the mufflers and was quite happy with the Torque Loopz cause I do like it quite, but I also like to opener up some times and this system does all that...quite when you want it and a little rumble when you like it. I know I'm taking it on faith about the sound, but I do know what an open flat six motor sounds like from my Rune's moded exhaust and hope to achive the same sound with the Jekill & Hyde adjustable system.
I paid full pop with no expectations of a discount nor will I accept any rewards from the Jekill & Hyde company, my review will be 100% unbiased. win, lose or draw.
More to come