All cars& tracks--Select Drag Race and win it, if your time is good enough, they will ask for your name. Enter MTHREE or NTHREE.
Secret Fear Factory Video--Do the same as above except enter AUXYRAY.
Cop chase mode--Do the same as before but enter VRSIX.
Unlock 4 Secret Cars--Type in NOLIFE (don't do this if you did MTHREE OR NTHREE).
Super arcade mode--Type in SPURT and the next time you race you will feel the cars driving faster.