The main things are the brakes-
But the SV is a budget bike for beginners,
Nail on the head there, you can really tell with the jap bikes how they are built down to their price.
To be fair even the stock brake setup on the gixxer begins to under preform on the track, can be improved with a good set of steel braided lines, decent pads and a proper bleeding but still, compared to a '10 plate zx-6r i tried you just don't get the same bite. Also as good as the stock forks are on any bike, given a proper revalve and spring setup will completely transform them.
Although I have to say I do love upgrading bikes, nothing better then buying some nice new shiny bits to bolt on, even if my wallet hates me for it. Which reminds me i need to pull my finger out and get a picture of my new zorst up, has really improved the sound of the bike tenfold.
![Headbang :hbang: :hbang:](http://www.sevenstring.org/styles/default/xenforo/smilies/hbang2.gif)