Reach the "Pro" rank to unlock the Oahu Raceway.
Reach the "Expert" rank (180 achievement points) to unlock The Reward multiplayer race challenge.
Reach the "Expert" rank (180 achievement points) to unlock the Ford Island race challenge.
Reach the "Champion" rank (450 achievement points) to unlock The Legendary Record multiplayer race challenge.
Reach the "Champion" rank (450 achievement points) to unlock the May The Best Man Win multiplayer race challenge.
Reach the "Champion" rank (450 achievement points) to unlock all challenges.
Win the Gold Cup in all Transporter extra challenges to unlock the Chrysler Firepower Concept Car.
Win the Gold Cup in all Race solo challenges to unlock the Chrysler ME FOUR-TWELVE.
Win the Gold Cup in all Convoy extra challenges to unlock the Ford Mustang GT-R Concept.
Win the Gold Cup in all Top Model extra challenges to unlock the Ford Shelby Cobra Concept.
Win the Gold Cup in all Speed solo challenges to unlock the Ford Shelby GR-1 Concept.
Win the Gold Cup in all Time solo challenges to unlock the Volkswagen W12 Coupe.
Win the Gold Cup in all Hitchhiker extra challenges to unlock the Volkswagen W12 Roadster.
Reach the "Amateur" rank to unlock Photos mode.
Reach the "Pro" rank to unlock Editor mode. In this mode, you can create custom challenges or modify already created challenges.
Reach the "Amateur" rank to unlock the tuner shops.
Drive along every road on the island to unlock the Walmaealamae Haven of Peace house, which has a 10-car garage, for purchase from any real estate agency.
Buy two vehicles to unlock the Chronopack.
Go to the bottom of the map by the crater. There is a speed challenge there that awards $40,000. A C-Class car is required (TVR Sagaris recommended). You can do it in about 1:30 to 2 minutes and get $40,000, which results in about $1,200,000 after one hour.
Take the highway to a spot near but not too close to an intersection. Find a racer and get them to do an Instant Challenge with you. Set the finish line just behind the start line on the opposite side of the highway. When the race begins, immediately turn over the center of the highway and drive past the finish line. Do this five or ten times and then do a race that is worth about $20,000. You will get a lot of money for the win. Note: This does not always work.
Take a Ford Mustang GT Coupe and/or Ford Mustang GT Convertible to the U.S. Muscle Car Tuner shop. They will ask whether you want them tuned as a Ford or Saleen. Press Down and select "Saleen". The new car(s) will have a sign that says "Saleen" at the top of the windshield. They will also be upgraded to C/D class cars.
This following is a list of the best overall cars and bikes for each class. Note: This is assuming you have the best performance kit for each vehicle without bringing it out of its class (mostly level 3). The first vehicle to appear is the best of the class overall. Others, such as the CC8S in A-class might be a better choice for long, straightforward courses. For the MA-class, the MV Agusta is better in all stats than the Kawasaki, but some prefer it because it is much cheaper than the MV Agusta and also because of its first gear being longer.
G-class
Shelby Cobra Daytona Coupe (great top speed, acceleration, and handling for its class, but has to be unlocked first; has stats similar to C or B car)
Lamborghini Muira P400SV (good top speed, 198 mph)
Aston Martin DB4 GT Zagato (good handling and lack of drift; costs $3,000,000; level 3 kit $80,000)
F-class
Audi TT Quattro sport
E-class
Nissan Skyline R34 GT (downloadable content only)
Nissan 350Z NISMO S-Tune
Audi S4 Cabriolet
D-class
Aston Martin DB9 Coupe
Cadillac XLR-V
C-class
TVR Sagaris (best for acceleration)
Lamborghini Gallardo Spyder (best for handling, 94%)
Noble M14 (best for top speed, 208 mph)
B-class
Ford GT (best for acceleration and braking power; same top speed as Dodge Viper SRT-10)
Dodge Viper SRT-10 (slightly better handling than Ford GT)
Farboud Supercharged GTS Prototype 2005 and Jaguar XJ220 (best for top speed)
A-class
Saleen S7 Twin-Turbo (best for acceleration 93%; and great top speed 250 mph)
Koenigsegg CC8S (best for extremely high speed, 263+ mph)
Enzo Ferrari (best for handling, 100% from the start; braking, acceleration, 90%; and lack of drift)
MB-bikes
MV Agusta F4 Brutale 910S (best for top speed)
Kawasaki Z1000 (best for acceleration)
MA-bikes
MV Agusta F4 Tamburini (best for top speed, 220 mph without drafting; handling, 100%; acceleration, 93%; braking power. 96%; and lack of drift; $45,000; level 3 kit $40,000)
Kawasaki Ninja ZX-10R (has same handling as MV Agusta, but top speed, braking power, and acceleration are worse; $14,000; level 3 kit $25,000)
G-Class Cars
F-Class Cars
E-Class Cars
D-Class Cars
C-Class Cars
B-Class Cars
A-Class Cars
MB-Class Motorcycles
MA-Class Motorcycles