Gran Turismo series creator Kasunori Yamauchi is a regular at the Special Equipment Market Association (SEMA) Show in Las Vegas. Each year he walks the floor and chooses a winning custom automobile to be digitized and made playable in the next version of Gran Turismo. IGN caught up with the Sony/Polyphony Digital developer at the convention for a brief chat about the custom car scene and Grand Turismo 5, the long-awaited next installment in the legendary driving series.