I picked up a hydro thunder that is working fine but I am wondering are there any upgrades or conversions that can be done to it. HD upgrades or something? Any ideas out there?
You can upgrade to a Compact Flash card... it doesn't give you anything new, but it boots faster and should be more reliable than the original HD. Also, search for cheats for the game... there's hidden boats and a hidden track that you can choose by pressing the "pilot" button 3 times before selecting.