Corvette

Level select:
Hold L + R, then press Up, Left, Down, Right, Left, Right, Left, Right when "Press Start" appears at the title screen.

Small cars:
Hold L + R and press Up, Right, Down, Left, Right, Left, Right, Left during game play.
Information in this section was contributed by mwelb.

1960 Corvette:
Win the 1953 race series.

1963 Corvette Sting Ray:
Win the 1960 race series.

1968 Corvette:
Win the 1963 race series.

1977 Corvette:
Win the 1968 race series.

1984 Corvette:
Win the 1977 race series.

1993 Corvette:
Win the 1984 race series.

1995 Corvette Sting Ray 3:
Win the 1993 race series.

Corvette 50th Anniversary:
Win the 1995 race series.