unfortunately with the closing of buell the prices fluctuate wildly for used XB's
I have seen similar bikes with similar millage go for anything between 3,500 and 4,500 some even set for sale still at 3,800 with more upgrades than that (race suspension).
not saying that it isn't worth 4,500 or that you cant get it just stating the market right now. the bike is VERY clean and modestly modded.
the other problem is that add-ons do no always equate to added value, if your prospective buyer does not want or is uninterested in the upgrades you have installed they will not be inclined to pay for them.
a race exhaust can easily go for 400 in clean condition but may only add 100-200 while on the bike. so to make the best dollar amount for the bike it would be best to return it to stock and sell the upgrades separately.
but fortunately a race exhaust is very popular not to loud and produces decent gains so there are a lot of buyers that would be interested in that piece but not all.
I am in Grand Rapids if you need any help I would be glad to see what I can do.