This page contains MX Vs. ATV Untamed Unlockables for PSP called "450r atv" and has been posted or updated on May 17, 2009 by twan3000000. Let us know what you think of this Unlockable by thumbs voting.
All you have to do is find a big hill back up get up to top speed before you get to the hill and this should break the hang time record and unlock your new quad if not try again until you break the hang time record.
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