To unlock a variety of cars to enhance your Ridge Race 6 experience, just complete the following races.
Burningforce Highjack
Finish Race 42
Dragonspirit Wild Gang
Finish Race 16
Gaplus EO
Finish Races 16, 26, 33-42
Gaplus Fatalia
Finish Races 3, 4, 5, 6, 8, 9, 10, and 11
Klik Starnose
Finish Race 6
Mappy Wild Gang
Finish Races 7, 8,9, 10, and 13
Mitsurugi Meltfire
Finish Race 23
Phelios Fatalia
Finish Races 6, 10, 11, 12, 16, 24, 25, 26, 33, and 34
Phozon Fiera
Finish Races 1, 2, 3, 7, and 8
Shootaway Fatalia
Finish Races 10, 12, 13, 14, and 15