Become president in these car clubs to have the corresponding cars get sent to your garage. Make sure you have enough garage space, or you won't recieve it.

Effect - Code

Chevrolet Corvette Stingray 69 - President of Classic Car Club
Ford Shelby Cobra Concept - President of Club Stripe
Caterham CSR 260 - President of Clubman Car Club
Jaguar Type E coupe - President of Club d'Elegance
Koenigsegg CC8S - Beat the Master Challange Series
Lamboghini Countach 25th Anniversary - Earn 1,000,000 points
Lotus Esprit V8 - Beat the Laenani Collection races
Mercedes-Benz CLK DTM AMG - President of German Car Club
Spyker C8 Spyder T - President of Accolade Ala Moana Club