Use the following passwords at the main menu:
All bikes: 65 SWEET RIDES
All movies: CHAMPAGNE ROOM
All Levels: XXX RATED CHEAT
Stage Select: MASS HYSTERIA
Las Vegas FMV 2: TASSLE
Las Vegas Level: SHOWMETHEMONEY
Itchi's bikes: ITCHI594
Amish Boy: ELECTRICITYBAD
Amish Boy's bikes: AMISHBOY1699
Hellkitty's bikes: HELLKITTY487
Karma's bikes: KARMA311
La'tey's bikes: LATEY411
Nutter's bikes: NUTTER290
Rave's bikes: RAVE10
Skeeter's bikes: SKEETER666
Mika's bikes: MIKA362436
Tripledub's bikes: TRIPLEDUB922
Twan's bikes: TWAN187
Green skin mode: MAKEMEANGRY
Happy bunny mode: FLUFFYBUNNY
Super crash mode: HEAVYPETTING
Night vision mode: 3RD SOG
Guided ghost rides: GHOSTCONTROL