exhaust, and front sprocket

[400ex00]

im have a stage 2 jet kit, kn air filter, white bros eseries exhaust.
i was wondering how many discs i should be running in my exhaust and what front sprocket do you guys reccomend do not
want factory. i was told to go to a 14 tooth front what do you guys think. also is the rev extender worth the money.

[Big - D Racing]

You don't need a aftermarket cdi box. Your bike can't produce any power that high in rpm's. When you get a full engine kit, then you could use one. I heard 7 discs is the what you want on the e-series. As for sprocket size it depends what type of riding. If your on a track, I run 16 front 37 rear (this is the type of gearing Duncan racing recommends too). In the dunes I switch to a 14 in the front for quicker off the line type dragging and hill climbing. The less amount of teeth in the front the more bottom end you'll have and the faster you'll have to shift through gears. You'll lose top end. The more teeth will give you more top end speed, but you lose bottom end. As for brand I run sprocket specialists and Renthals. If you do a little of everything and don't like to change your gears all the time, just keep your stock gears. They're a good all around gear ratio.