Get a huge riced out wing, i mean masssive like twice the height of your car ..'fix your understeer in no time
now as far as understeer... it is actually a good thing for ur car to have a bit of understeer as it makes the car more stable on turns (for the avg driver) then oversteer would... there's a lot of things you could do to improve such as getting better tires in the front, rear sway bar, and lowering the front of the car, stiffer rear springs are probably the most common ways used to improve understeer... but here's a list i found from a quick google search... and to correct oversteer is basically the complete opposite of the above
well it is true, depending on the path and speed u take, it changes the amount of understeer and oversteer u get... of course this is mainly referring to a track, and not dd