I had the Remus for a while. It did open up the upper rev range, and it did eliminate the 4500rpm vibration. I just couldn't stand the noise. It had a booming sound at 2k or so rpm, like riding around town. Sounded like a car that needed a muffler. Many like it - I didn't.
I reinstalled the original exhaust without using the center mount. The vibration is still gone.
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