INVALID CODE??The
code below was reported invalid by Users-You Decide

When you jump of a ramp press the following (don't hold down the
buttons): Z, A, A, R, L, Z, Z, Z, B, A, B, A.
When you land come last in the race then start a new race and there
will be no gravity.
Unlimited Shields & Turbo
Go to the press Start screen and press L + R, Z,
L + R, Z.  A message saying unlimited energy Turbo will appear if
done correctly
Get Jump Start
Press forward on the stick but do not hit the
gas button till the Go appears
Get Starcon team
Finish XG career mode once