i honestly have yet to confirm any benefits from it. just thought it would be something to kill time. i've read on the forum that the valve is supposed to open up around about 6k or so, but when i started the bike with the EXUP servo motor in my hand and revving around, it would start to move before that, though just a little bit. the low end sound seems a little different now as well, slightly deeper and more clear...not too much louder though. perhaps i'll notice the difference after riding around a bit more...or maybe someone who's as bored as i am could get a dyno of before and after.... we'll see..
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