The 17 450 is now a 500cc engine. 16 was a neutered 570, and 15 was the ETX model, not a 450, with the 325 from the original Ace.
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2015 Sportsman 570
Big Horns, QSC Clutch kit, Heat Demon heated hand grips, Super Winch LT 2500, GSE Air Filter, Tusk hand guards, Polaris Lock and Ride rear bag, custom LED headlight pods-made by me, gripper seat cover, AGM battery, RVS ECM Stage 1.5 Tune
Future upgrades: ???
2017 RZR S 570
Polaris Lock and Ride Sport Roof, SSV Works Overhead Stereo
Future upgrades: R2C Air Filter, Doors
2015 Sportsman ETX - SOLD
2010 TrailBlazer 330 - SOLD
2007 Scrambler 500 HO - SOLD
1996 Sportsman 400 - SOLD