ATV Quad Power Racing 2 Cheat Codes for Gamecube

Get Dimension and Viper
Finish ATV Academy Training, and also Trick Training.

Get ATC
Come first in eight arcade mode races.

Code - Result:
GOLD DUST - Unlock Everything
BUBBA - All Riders
ROADKILL - All Tracks
GENERALLEE - All Vehicles
GINGHAM - Max Stats
FIDDLERSELBOW - Tricks
REDROOSTER - Unlock Champ
DOUBLEBARREL - All Challenges

Easy Turbo
When going off a huge jump do a 360 by pushing the direction stick
right or left and do two tricks while doing the 360. The better
the tricks the better the boost. If you can get more than two
tricks in at that time thought it can help alot more and almost
fill your boost totally in one trick.

Super flips
Go to the freestyle level. Get your boost all the way up. Start going around the course to get speed. If you choose to use the loop as your take off, you need to boost all the way around it. Another good ramp to use is the one that is sort of under an elevated ramp; you will not need boost. To do many flips, choose your ramp and get speed. When you are about 20 feet away from the take off, hold [Analog-stick Down]. Keep it held and when you get to the peak of the take off, you will do many flips. Use the following trick to do three or more flips on the ground. First, do a wheelie then keep it held. Hold [Preload] ([R]), and when it is full, release it. While holding [Analog-stick Back], you will do three or more flips.
Submitted by: Michael

Quick turn:
When going fast and are trying to turn, use the speed boost while
turning. The bike will seem to jump forward.