OMG, this was an awesome, awesome game; the co-first game I got on a 2 disc case that included JSRF as well as Sega GT 2002, which is another fantastic game.
This game gives off this amazing, unique, grungy kind of vibe that you won't find anywhere else. Original Xbox had games with original attitudes pulled off so well that sadly I don't think are coming back anytime soon. I will download this game if I can find a way to emulate it.
UPDATE!: The original JSRF is 85% off on steam right now, only $1.19
It doesn't look anywhere nearly as good, I played a demo of it for like 10 mins and the controls seemed very clunky and the graphics are pretty lacking. I'll probably buy it anyway because it's the price of a Sweet Tea from MickyD's.