Sup guys, I was on fourstrokeworks.com and was lookin at their pumper carbs, but I was wondering which is the best for my application I have a KLX300 with a big gun full system and an Uni filter, plus the free mods. They offer a Mikuni 36mm TM Pumper Carb w/o choke, and they offer Keihin FCR Pumper Carburetors in 35mm and 41mm w/ or w/o a choke. 1st, Is the choke necessary with the pumper, 2nd whats the best throat diameter for a stock 300? with a big bore too, in case i get one? Oh, and which company typically has a better product? Also, how much HP and throttle responce does a new carb actually add? how noticeable is it? And what else do you need to install one ie, new throttle, new cables, etc...?