Various cheats        

Unlock all Thunder Plates:
     Enter  the  [Edit Driver] screen, then enter "Open" as first name
and "Sesame" as a last name. Both names are case-sensitive.

$10,000,000:
     Enter  the  [Edit  Driver]  screen, then enter "Walmart" as first
name and "NASCAR" as a last name. Both names are case-sensitive.

Lakeshore Drive track:
     Enter  the  [Edit Driver] screen, then enter "Walmart" as a first
name and "Exclusive" as a last name. Both names are case-sensitive.

Unlock Dale Earnhardt Sr.:
     Enter  the [Edit Driver] screen, then enter "The" as a first name
and "Intimidator" as a last name. Both names are case-sensitive.

2 million prestige points:
     Enter  the  [Edit  Driver] screen, then enter "You" as first name
and "TheMan" as a last name. Both names are case-sensitive.

All Dodge Track events:
     Enter  the [Edit Driver] screen, then enter "Dodge" as first name
and "Stadium" as a last name. Both names are case-sensitive.

All Mr. Clean cars:
     Enter  the  [Edit  Driver] screen, then enter "Mr.Clean" as first
name and "Racing" as a last name. Both names are case-sensitive.

All Dodge Track events:
     Enter  the [Edit Driver] screen, then enter "Clean" as first name
and "Crew" as a last name. Both names are case-sensitive.