I have just recently purchased my first DR-Z 400S. Its a 2007, with 1600 miles on it. Im to the point where i want to go to the RS-3 Yoshi Exaust, 3x3 mod, and different carb. I have done a lot of research reading through past posts, and just want to get some idea of the best route to take. i see the FCR carb is popular, is this the best bet? I want to improve throttle response, and straighten the power band. Is there another carb that is popular, and or is there a specific model of FCR that is best. Used carb vs new? Thanks!