Here is what I know about this game (which is not much)...please note that I do not own this game so I have no experience with it.
WIKIPEDIA FACTS:
1. The game was released on Dreamcast one year prior to the PS2 version.
2. It is a remastered version of the PSX/Game Boy Color/Windows version.
3. Per Wikipedia, there seems to be no differences in the PS2 and DC versions.
4. There are ISO's of it out there but I am not going to download it being I'd rather buy it.
5. There are VMU saves that will unlock "stuff".
6. There are also codes you can use (list below per GameFaq):
CHEAT CODES:
All Abilities = BARGAINBASEMENT
All Cars = WACKYSPOILERS
All Tracks = WACKYGIVEAWAY
Super Difficult Mode = CRACKEDNAILS
RACE CODES:
1. First Place Finish = In championship mode when your car is in first at the start of the race press Start + Select + A + B.
2. Zero Lap Time = In trial mode when the flag is waved at the start of the race press Start + Select + A + B.
All that being said, there is no reason to "hack" or "mod" the game...based on your PS2 game play as listed above. Just buy the game off ebay...$29.99 including shipping.
ebay:
https://www.ebay.com/itm/Dreamcast-Wack ... SwE95gAPkP