Don't worry, we haven't forgotten about the Mazda 323, Diamond Star triplets and various Audi quattros, but the Subaru Impreza WRX helped blaze a trail a decade ago. The WRX paved the way for the all-wheel-drive, rally-bred machines that would dominate the first tenth of this century. Without that first U.S.-spec WRX, would there have been an STI or Lancer …