I run stock sleds in both of our turbos, with some adjustments. I run the reas shock with higher psi & run a tad less preload on the front (not a ton) and I'm happy with them. NEED would be an overstatement for sure, but they could always use some re-valving though. I just hammered mine sunday afternoon as fast as I could down some whooped out trail & was notable more impressed than with previous sleds in how well it took the hits.
Maybe that's cause the turbo can keep the front up? not sure, but I could go way faster than even my 09 could on a similar trail. I'd hope the 12 is even better, keep in mind that the geometry will be pretty different too, so not sure if that's gonna help or hurt that side of things.