TURBO OUTRUN w. the Ferrari F-40 and the nitro boost! Game might be old, but it still rocks the mutha fuckin' houze to the extreme. Of course the arcade version is the best, but the MEGA DRIVE cart will suffice.
In second place... RAGE RACER *The game simply ownz, acutally this would be in first place as far as "GRAND PRIX" racing games go, since the Outrun series has always been a cross country Canon Ball Run type deal.
In third place... SUPER GT / SCUD RACE. SEGA's model 3 racer that sadly never made it to the Dreamcast. I freggin' love this game!
MD20XX / Storm Rider