there are 2 rangies. 1 is the real ange rover and the second is a range rover sport which is in fact based on the discovery 3.
both can have the supercharger option & sports package.
Overfinch does engine conversions and bore kits as well as suspensino, brakes etc and body styling.
Imagine if you will that overfinch is like brabus (for mercs) for land rover products and the supercharder rangies are like AMG for mercedes (in house tuning)