Do the following tasks to unlock cars:
Dominator Assassin: game detects Burnout 3 save file
Madden Van: game detects Madden NFL 2006 save file
Logitech World Racer: finish Rank 10 Ultimate Revenge GP
Black Elite Racer: get ELITE Rank
Nixon Special: finish Eastren Bay Challenge Sheet
Hot Rod: finish Lone Peak Challenge Sheet
Euro Classic LM: finish Eternal City Challenge Sheet
Criterion GT Racer: finish White Mountian Challenge Sheet
Custom Classic: finish Sunshine Keys Challenge Sheet
EA GT Racer: finish Central Route Challenge Sheet
Low Rider: finish Angel Valley Challenge Sheet
Etnies Racer: finish Motor City Challenge Sheet
Revenge Racer: Get 100% Game finish