PAL to NTSC:
74260876 72AA
34260870 72DC

Y-Fix:
7421FEBA 98BC
8421FEBA 98AC

Start with speed burst:
7421113B 7B13
3421113B 7B11

Better speed burst:
742459CF C017
342459CF 3FD6

Better Traction (press L1+L2):
742277E7 C916
342DC665 B5F8
742277E7 C916
04245F23 45AD

Start at Lap 3:
74201614 82F6
34201614 82F4

Obstacle courses mode
All Tracks:
34201632 821F

Start with many points
742116CE 9020
842116CE CA66

More points for each leaf:
74240420 7C2D
84240420 7F85
74240422 6CAA
84240422 48B8