Originally Posted by Lion BR
It sounds like it is whizzing dog. It will benefit from an aftermarket exhaust.
It sounds very much like my ninja 650 did, and it should sound like that
since it's the same engine setup. The problem is most aftermarket exhaust
actually make it sound worse in my opinion, thin and "screamy".
I only liked the Akrapovic and Arrow on the 650R, and only up to about
half the revs, then, again, it goes bad.
If you don't like the way this thing sounds look at the NC700, they've got
a completely different note and sound very deep stock.