To be honest, I am not sure but I had the guys at Wong's (a performance shop that was here is Idaho) do the work as they suggested the mod to provide full top end with the '00 800 Polaris motor.
They are 40mm stock I guess, well if you still have them in the spring I might take them off your hands. I moved from BC to Saskatchewan and only go back to ride a couple times a year. I think this summer I'm gonna rebuild the engine and bored carbs should work with the twin pipes pretty good..