I am pretty sure there are only bolt ons for Busas. Some bikes have pipes that are slipped on, Busa's bolt on. So there really isn't a technical difference between slip-on and bolt on, merely the method of attachment for a particular bike.
Yes it is something you can do yourself. A lot of people here prefer the full systems, which while a lot more work, can still be a DIY project.
If you want looks and sound with a neglible increase in power and a little weight savings, get bolt ons. If you 8-10 more hp and an even better weight reduction then get a full system and a powercommander. There is a significant increase in cost though, considering what you have to get.