go on the Pioneer website and check it out .
it lowers the wheels instead of using larger wheels , and includes an extra pair of wheels .
I couldn't believe how much better the sled coasted , when you let off the gas . less friction equals more speed , or better gas mileage if that is a concern .
I have duponts but never even bothered to put them on yet , as the stock sliders stopped wearing .
My sled is a 2015 Apex XTX , and most of the add ons went on before I drove the sled once , and the wheels went on after 2 rides .
All the upgrades I did were based on reading this forum .
It doesn't matter how much you weigh or how short or tall you are , you gotta do the star suspension , and the WRP seat, if you really want to enjoy your new sled . oh ya and the snowtrackers , and the 13 mm sway bar , and the lakeeffects riser , and , and , it is addictive doing things to make a really good sled great !