[credits: by switcherjoe]
[Unlimited Nitro]
580F0000 03A88110
580F1000 00000020
580F1000 00000078
580F1000 000000D8
580F1000 000000B0
780F0000 00000020
620F0000 00000000 00000009
[65535 Coins Per Race, unlocks almost everything]
580F0000 039BE878
580F1000 000000B8
580F1000 00000000
580F1000 00000058
580F1000 000001B8
780F0000 00000038
620F0000 00000000 0000FFFF
[Infinite Fuel]
580F0000 039BDAF0
580F1000 000000B8
580F1000 00000038
580F1000 00000020
580F1000 000001B8
780F0000 00000028
640F0000 00000000 4299AD72
[Infinite Fuel (alternative cheat)]
04000000 0152E48C 1E282808
[Infinite Nitro (alternative cheat)]
04000000 01513980 52800120
[Unlock all cars besides F1]
08000000 014A3870 52800000 D65F03C0
[Disable front collision speed debuff]
04000000 024DCA50 D65F03C0
[Always first place]
04000000 0138E63C 52800020
[Start race from first position]
04000000 01447308 F9405661
04000000 01447310 AA0003E2
04000000 01446604 52800028
04000000 01446650 11000508
04000000 01446638 52800008
[Unlock Ayrton Senna DLC cars]
04000000 024C1E28 52800021 
04000000 024C1E50 52800001 
04000000 0147A57C 52800034 
04000000 0147D44C 52800034 
04000000 0147DE04 D503201F 
[cheat codes (use DPad arrows in the main mode selection window), WARNING - the unlocks are given forever for a user:]
[LeftArrow->DownArrow->RightArrow->UpArrow->LeftArrow->DownArrow->RightArrow->UpArrow => UnlockAllCarsCombo]
[UpArrow->UpArrow->DownArrow->DownArrow->LeftArrow->RightArrow->LeftArrow->RightArrow => UnlockAllGameModesCombo]
[RightArrow->LeftArrow->RightArrow->LeftArrow->DownArrow->DownArrow->UpArrow->UpArrow => UnlockAllExtrasCombo]
[UpArrow->DownArrow->LeftArrow->RightArrow->UpArrow->DownArrow->LeftArrow->RightArrow => UnlockAllWorldTourCombo]
[DownArrow->DownArrow->DownArrow->RightArrow->DownArrow->DownArrow->DownArrow->RightArrow => UnlockAllUpgradesCombo]
[DownArrow->DownArrow->DownArrow->DownArrow->DownArrow->LeftArrow->LeftArrow->LeftArrow->LeftArrow->LeftArrow->UpArrow->UpArrow->UpArrow->UpArrow->UpArrow->RightArrow->RightArrow->RightArrow->RightArrow->RightArrow => UnlockEverythingCombo]
[DownArrow->LeftArrow->DownArrow->LeftArrow->RightArrow->UpArrow->RightArrow->UpArrow->DownArrow->DownArrow->DownArrow => AllPlayersAsBotsCombo]
[DownArrow->LeftArrow->DownArrow->LeftArrow->RightArrow->UpArrow->RightArrow->UpArrow->LeftArrow->LeftArrow->LeftArrow => Players2to4AsBotsCombo]