Jake I really think it is better with the kit , although I havent tried it with something stock. All cylinders that I own, get ported, stock or not. Because this pipe kicks in so late on my kitted ped, I don't think it would work well with stock.
Stock ped - boss or somesort of 4P
You really need to figure what your needs are as for setting up your ped. If you are thinking of a kit, you have to think of carb and pipe also. What are you looking for. Check the wiki spreadsheet and research . It will help you out , like you won't believe.