want to do Nyroc's exhaust mod , the thing is my bike already runs lean and coughs and stuff when cold actually never had such a cold blodded machine, almost to the point you get really irrataded. already had the dealer try to adjust stock needles but not much better.Should I just jet and get it done with and what the settings that would work the best, I read 142f and 145r I live in VT and its cold alot. also I am going to get a kn filter unless there is a better filter out there.also will this exhayst mod be pretty much the same as changing the pipe to an aftermarket pipe.