My first memory of the Subaru Impreza WRX: carving up eight twisty race tracks at 140 MPH, shredding tires, crashing into various walls and cars, and in the end, consistently whooping my best lap times earned in a Corvette, Supra, Skyline, RX-7, 300ZX, or NSX. OK, so all this was achieved with my left and right thumbs in front of a 20-inch dorm room TV, but hey, Gran Turismo is the ultimate driving simulator, is it not?I figured if the real thing were half as good, I had to have it. Apparently I wasn't alone: that 1998 PlayStation staple has been cited as the cause of Subaru's most impressive Impreza selling 230% as well as planned after arriving four years later. Things have gotten tougher since then - the WRX got an actual competitor and the automotive version of Moore's Law dampened its impact - but Subaru isn't about to let its living legend slip.They've changed at least one big thing every year since its launch. Two years ago it spawned a 300-horsepower brother; last year it got an interior makeover; this year's revisions are best seen from the outside. More prominent are the mechanical upgrades for all Imprezas, with the 2006 WRX in particular enjoying enough engineering to almost qualify as a new car.