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you can read up at the supertrapp website and they have forums with tech moderators who are helpful.
I have/ had a bunch of Harleys running supertrapps, and the nightstick is very similar to the supermeg- similar enough that I used nightsticks on my 09. set up the disc stacks and end caps to my liking in a few minutes.
I set mine up for performance, the sound level is moderate, a following rider knows if I am accelerating, slowing or cruising without having to stare at my brake light.
traffic knows i am there ( unless they are on the phone).
If I want louder- I have snuff r nots, which are solid end caps with ports which open with an allen key
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