Here they are.

Unlimited 4X damage-Press L(2), R(2), L, C-Up, C-Right, Z at the menu screen. Display debug manu-Press C-Right(2), C-Left(2), L, Z, C-Left, C-Up at the menu screen. All weapons-Press C-Up(4), C-Down, L, C-Left, Z at the menu screen for all weapons in thrash and multi-player modes. Alternately, press C-Up(3), C-Down, L, C-Left, Z. Scooters- Press C-Down, C-Right, C-Up, C-Left, C-Left, L, C-Left at the menu screen. All bikes and tracks- Press C-Up, C-Left(2), C-Right, L, R, C-Down, Z at the menu screen. Insanity level- Press C-Up, C-Left, C-Left, C-Right, L, R, C-Down, Z at thrash mode.

Be The Cop- Press Z, C-Left, C-Down, C-Left, Z, L, R, C-Down at the menu screen.

Level 2 R C> Z R L C^ C< C^



Level 3 R C> C> C> R C< C< Z



Level 4 R C> Cd C< C> C> C> L



Level 5 Z C> Cd C< C> C> C> L



Insanity Bikes C^ C< C< C> L R Cd Z



Cop Mode Z C< Cd C< Z L R Cd



Scooters Cd C> C^ C< Z Z L C<



Infinite x2 Damage L L L L R R R R



Infinite x4 Damage L L R R L C^ C> Z



All Weapons C^ C^ C^ C^ Cd L C< Z