Quick start
During the pre-race countdown, hold A to accelerate until "Set" appears. When it does, tap A a few times and hold the button again. You should get a speed boosted start when "Go" appears.
Unlock Cars and modes
Win all races in challenge and free style modes, complete cruis'n exotica mode twice, and get 40,000 miles to unlock the Heavyliftin', Lil Lightnin', Jalopie, Bad Mobile, Hunkajunk, Skidmarks, G-Ride, Cooler, Piewagon, Boxcar, Scrapin' By, and Glide cars. Four more of the fastest cars that can also be unlocked are the Formula 2, Whiplash, Rail, and Rocket. You will also unlock Wacky and Insane modes.