Put "pods" in the search engine, and you'll find a lot of info and opinions. I'm currently podding a bike that had absolutely no air filters whatsoever, and the stock airbox was long gone.
After putting on the pods, I'll begin the obligatory rejetting.
Unless you absolutely LOVE taking your carbs apart countless times, buying and installing main and pilot jets, messing with needle position, all to get a bike to run--if you're lucky, and know what you're doing--just about as well as a stock bike, and you'll probably have low rpm stumbles, etc, becuse you don't have the tuned intake length of the stock air system, then go with pods...lots of variables with pods...
Some bikes run with minimal carb adjustment after installing pods...others never run quite right, no matter what you do..
Just my .02