The 599 is a very nice little motorcycle, pretty much as is.
The stock muffler was high, heavy, and restrictive. The EPA mandated jetting was pretty bad. Those 2 things are just about all a 599 needed. I went with a -2 rear sprocket, which got rid of the frantic rev nature of the bike, further smoothed things, and nearly corrected the speedometer.
SS brake lines are nice. An Ohlins is a luxury, and can be used to raise the back end (just a little).
All of the rest of that jazz, that's been done to that thing makes little sense to a used motorcycle buyer. One one hand, the rear fender was so ugly, it had to be hacked off, and the rear turn signals were replaced with those tiny, little things, but on the other hand, there's that big clumsy top box, with all that cluttered looking bracketry. Throw carbon fiber at it, but don't bother to take the warning stickers off of the swingarm, and chain guard. I'd get rid of that 2 Brothers sticker, too. Those "frame sliders" have been know break engine cases. Those ought to go away, as should the Ram mount.
I'd take all that stuff off, and start over by selling every thing separately, chop shop style. You have a nice little bike, but by putting all that stuff on it, it just doesn't have the broad appeal that a bone stock bike has. Why are you going to give the Pit Bull stands away?! I'll take them!
*I like looking at used motorcycles on Craigslist. I looked at a couple hundred last night. Saw only 1 that l would consider buying. It was a Ducati 851 (I think) Monster, that a 65 year old guy had. It was totally unmolested. The first thing that l look for is a stock rear fender, and stock rear turn signals. If the bike doesn't have those 2 things, l move on.