This code describes the name of the car and when or where you unlock it.

You get these at the beginning.

Phantasm Chrome
Low Carbs
Overbored Torpedo
High Voltage
Slider
Stockar
Split Decision

Beat Stage Ignition to get these cars.

Diesel Boy
Paradigm Shift

Beat Challenge Turbo to get these cars.

Blastous
CUL8Ter(pronounced:see you later).

Beat High Performance to get these cars.

Brutalistic
Formul8ter(pronounced:Form-you-Later)

Beat Extreme Racing to get these cars.

Bully Goat
Pharoahdox

Beat Burning Wheels to get these cars.

Itso Skeenie
Mid Drift

Beat Ultimate Challenge to get these cars.

BurlEsquE *** Don't ask me to pronounce this one because i don't know
how***
Preying Menace
Firestorm

Beat Collector mode easy, medium, or hard to get these cars.

SirOminous (easy)
Horseplay (medium)
Hammersled (hard)

Beat Survival Mode on easy, medium, or hard to get these cars.

Symbolic (easy)
Quad Rod (medium)
Low-C GT (hard)