Want to improve the performance of you 1990's Rover?  J.E. Robison owns an independent Land Rover service center in Massachusetts, USA and he provides an interesting article / review guide about installing a Superchip upgraded performance chip in your Rover.  It covers Superchip upgrades for 1995-1999 Range Rovers with GEMS engine management, 1996-1999 Discovery I models, and 1997 Land Rover Defenders.