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Years ago I put them on my '91 FXRS and they really smoothed out the engine. I used to have a pretty significant buzz around 2500 rpm and they eliminated that completely. They also took quite a bit of the shake out of it at idle.
I installed a vela touch on y 98 FXDWG this past summer and it made about a 40% improvement over the stock mount. I was pleased with the difference. They cost more, but the improvement was much better. I just hope they last as long as the stock one did.