I have an stock 05 blaster and a $500 budget what upgrades/mods do you recommend making? I was thinking some razr tires and nerf bars but thats about as far as I got.
Get yourself a used FMF Gold Series Pipe and Powercore 2 Silencer, new Uni Filter, take your airbox filter off if you don't do a lot of mud or water, properly jet your carb starting at about 290 main jet. After that I would look at some tires.
quadsrus1 you have a good Idea but you shouldn't port your cylinder unless you have an aftermarket pipe and filter first because that engine needs to breath and with a stock pipe and silencer and a filter you will not be able to achieve max performance out of the port work.