To get the nissan skyline,corvette and the charger
Corvette :take the nissan 350z and beat the gold difficulty on the last street cross event (boss race:Hit The Apex)
Nissan Skyline: Take the corvette you won and use it the beat the same race on gold difficulty (boss race:Hit The Apex)
Charger: Take the subaru that you bought and use it to beat all the pro boss races on difficulty
When I heard... when I heard we were going to be in a movie I was like F**k Yeah! - Louis, Stewie Griffen: The Untold Story