The biggest difference is the filter, just ask the dealer if it has the latest filter (it looks to be larger in diameter). If your planning to upgrade soon, it shouldn't matter really.

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'08 Gen3 Polaris RZR, Trail Armor soft top, Trail Armor CV guards, Polaris Rock Sliders, Polaris Front Bumper, Polaris full windshield, Garmin GPS 60CSx with Ram mount, Factory UTV UHMW skid plate, UMP Superfilter, Polaris 3500lb winch, ITP 212's with Swaplite tires
'06 Polaris Hawkeye 300 (my son's ride)
'04 Polaris Scramble 500 (need to sell)