Fox arms are shorter and reduce your track width. 03-04 Cobra arms don't widen your track width, but they move the wheel center forward for more camber and better control. The track width on a stock SN95 is more than adequate. The oversteer problems come from the back. Buy a Steeda rear roll bar (it's actually a yaw bar, but nobody know the difference), and it will correct your understeer with proper adjustment.
Kurt