they are in fact keihin d slide carbs i run them on my banshee and my friends runs them on his they are awsome carbs excellent throttle respose uses your stock boots but i will tell u it is a bitch to get your boots to stretch that far like 20 mins each lol and cpw will in fact do most of the work for u tell them your altitude engine specs and they will send your carbs closely set up all u have to do is get your fine tuning they even send u extra jets just in case