Unlockable cars:
Unlock the following cars by defeating them in the corresponding races in the Pro Tour:

Angelus – Pro #27 Races
Angelus Kid – Pro #29 Races
Crinal – Pro #28 Races
Crinal Kid – Pro #30 Races
Digdug Hijack – Pro #25 Races
Dragonsaber Wild Gang – Pro #26 Races
Pack-Man – Pro #31 Races
Yamasa Raggio – Pro #32 Races

Videos:
Unlock the following videos by performing the corresponding tasks:

2004 E3 – Win all races in E45.
2006 E3 – Win all races in E47.
R4 Opening – Win all races in E41.
Rage Racer Opening – Win all races in E40.
Reiko Movie (staff list) – Win all races in Pro 24.
Ridge Racer Opening – Win all races in E46.
Yamasa Raggio Movie – Win all races in E48.