I had an order in for the epic rear axle, then there manufacturer decided they weren't going to make any more. ~$1000 for an RPM axle is WAY steep so I did some research and found that LoneStar racing is making an axle for the DS450 that will take the stock equipment. The also have 2 axles one is solid the other is gun drilled like the stock axle. The weight of the gun drilled axle is the same as the stock axle and it is going for $570.
Here is the link to lonestar racing
http://www.lsracing.com/can-am-ds450.htm
That is the axle I am going with. They won't have any available for another 2ish weeks.
http://teambigotires.com/
DS450
Flexx bars
BRP Nerfs
BRP Heel baskets
Motoworks Exhaust
Motoworks Oil-less airfilter
Motoworks FMI
Fox Float Evol
Fox Podium X
Epic A-arms
LoneStar Gun Drilled rear axle
Holz Steering stem