By Viper
Max Power Modifier (Default 0005)
810770BE ????
Power Increase Rate Modifier (Default 0001)
810770C6 ????
FFFF should cause it to decrease by 1

Power Never Increases
810770C0 1000
Power Never Increases (Alternate)
810770C4 2400
Power Never Increases (Alternate 2)
810770C8 2400
Power Never Increases (Alternate 3)
810770B4 0801
810770B6 DBDC
Don't Lose Power From Missing Buoys
811F0CA4 2400
Starting Power Modifier
81075A98 2400
81075A9E ????
81075AA0 1000
Miss Worth Modifier (Default 0001)
810771A6 ????
Misses Don't Count
810771AC 2400
Number Of Misses To Retire Modifier (Default 0005)
810771B4 3418
810771B6 ????
Out Of Course Timer Increase/Decrease Rate Modifier
811F18BA ????
FFFF is the Default. FFFE will make it go down 2 at a time, FFFD - 3, etc. positive numbers like 0001 will increase it.

Out Of Course Timer Doesn't Count Down
811F18C0 2400
Disable Out Of Course Timer
8107A61C 2400
Lap Timer Doesn't Run (Stays At 0'00'000)
81076BA8 2400
Stunt Mode Timer Increase/Decrease Rate Modifier (Default FFCE)
8107864E ????
Stunt Mode Timer Doesn't Count Down
81078654 2400
Stunt Mode Timer Starting Value Modifier (Default 3A98)
81075C7C 3418
81075C7E ????
P1 Codes
Always Place 1st
801BFF4F 0000
P1 Lap Timer Below 0'00'10
811C00E6 0000
Start On Lap Modifier
801C8923 00??
01 - Lap 1
02 - Lap 2
03 - Lap 3
04 - Lap 4
05 - Lap 5
06 - Lap 6
P1 Infinite Time Out Of Course
801C0233 00FF
99 Points
801C8953 0063
Score Modifier P1-Stunt Mode
811BFCE2 ????
Automatic Retire
801C0234 FFFF
Lap Counter Stays On-Screen
801C0253 00FF
P1 Always Be 4th Place/Glitchy Ranking
801BFF4F 00FF
Infinite Race
801C007F FFFF
If you miss a single arrow then you'll be disqualified, but you can still race for as long as you wish!
P2 Codes
Power Modifier P2
801C069A 00??
Infinite Misses P2
811C03F6 0000
P2 Lap Timer Below 0'00'10
811C045E 0000
P2 Infinite Time Out Of Course
801C05AB 00FF
Fake Always Place 1st
801BFF4F 0000