By Viper
Max Power Modifier (Default 0005)
8107724E ????
Power Increase Rate Modifier (Default 0001)
81077256 ????
FFFF should cause it to decrease by 1

Power Never Increases
81077250 1000
Power Never Increases (Alternate)
81077254 2400
Power Never Increases (Alternate 2)
81077258 2400
Power Never Increases (Alternate 3)
81077244 0801
81077246 DBDC
Don't Lose Power From Missing Buoys
811B0CF0 2400
Starting Power Modifier
81075D18 2400
81075D1E ????
81075D20 1000
Miss Worth Modifier (Default 0001)
81077336 ????
Misses Don't Count
8107733C 2400
Number Of Misses To Retire Modifier (Default 0005)
81077344 3418
81077346 ????
Out Of Course Timer Increase/Decrease Rate Modifier
811B18F2 ????
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
811B18F8 2400
Disable Out Of Course Timer
8107A7A8 2400
Lap Timer Doesn't Run (Stays At 0'00'000)
81076D38 2400
Stunt Mode Timer Increase/Decrease Rate Modifier (Default FFCE)
810787E6 ????
Stunt Mode Timer Doesn't Count Down
810787F0 2400
Stunt Mode Timer Starting Value Modifier (Default 3A98)
81075E0C 3418
81075E0E ????
P1 Codes
Always Place 1st
801D040F 0000
P1 Lap Timer Below 0'00'10
811D05A6 0000
Start On Lap Modifier
801D8DE3 00??
01 - Lap 1
02 - Lap 2
03 - Lap 3
04 - Lap 4
05 - Lap 5
06 - Lap 6
P1 Have No Laps To Race & Always Place First
801C293B 0003
801C2C5B 0003
P1 Infinite Time Out Of Course
801D06F3 00FF
99 Points
801D8E13 0063
Score Modifier P1-Stunt Mode
811D01A2 ????
Automatic Retire
801D06F4 FFFF
Lap Counter Stays On-Screen
801D0713 00FF
P1 Always Be 4th Place/Glitchy Ranking
801D040F 00FF
Infinite Race
801D053F 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
801D0B5A 00??
Infinite Misses P2
811D08B6 0000
P2 Lap Timer Below 0'00'10
811D091E 0000
P2 Infinite Time Out Of Course
801D0A6B 00FF
Fake Always Place 1st
801D040F 0000