its many differnt things, mostly the general idea behind it and there are differnt categories of rice.
The lowest being Rice Boy(thats me)= you drive an import and with your small saving or no saving you mod you car to the best of your ability thus getting you an exhaust system consisting of a disconnected stock muffler(note the backfiring)(or an exhaust tip), and Intake
system with all the parts found at your local home depot, neon underbody lights from wal-mart, every modification from wal-mart such as cyber eyes and lights that flash to the music...
Next up is ricer= ppl who actually have some money to spend compared to the rice boys, they buy real mods like Injen Intakes
, exhaust systems, some interntals, a body kit, basically so it looks nice.
Rice god= you drive something like a supra, nsx, rx-7, or skyline and have to much money to spend on your car alone. You own everyone in your 1200hp single turbo supra at the tracks just cause you run a 9.05sec @150mph 1.4 mile. Everyone wished they were you. Your car also is in shows like HIN city.