There are two cheats for this game.
One is for all sleds, one is unknown.
Enter R, X, L, Down, Right, LB, L, R, Y, X at the cheat codes screen.
Enter Up(2), Down(2), Left, Right, Left, Right, X, Y at the cheat codes screen.
(From Gamewinners but can be found on all cheat sites)
Awesome meter always full
Enter Up, RT, X, Y, LB, X, Down, LB, RT, RB as a code at the "Cheat Codes" screen under the options menu. If you entered the code correctly, the word "On" will appear.
NOTICE: These will not let you get achievements or let you save the game
pm me if you have questions...