So, I was on ebay looking for deals and came across the full two brothers system for the z650 brand new but open box test fitted for a ninja 650 and it didn't fit but never ran for $400. That's nearly half off so I snagged it. Anyone else have one? Hows it sound and how noticeable is the power loss without a tune? It should get here in about a week or so but I'm excited for it.