my sled is just a 600 i have it geared down, 1.75" paddle track, can on it, c&a Razor skis, 8" riser, Customized sc4 skid(with rear billets, all outside wheels eliminated, rear race shock revalved by ian(monser Performance)), Put Ryde Fx Air 2.0s on the front pumped up with nitrogen to 300 psi on top and 350psi on bottom, blacked it all out, put new crank in it, all new bearing including chaincase/driveshaft/wheels/jackshaft., new pistons and rings, new cylinders, TBO snowflap(SLED-X.com), clutched(my own clutching), welded y pipe with brace, put on boysen rage cages, ported the clutch guard for increased cooling, pulled the windage plates, added some venting and prefiltering. I think that is pretty much everything i have done, oh yea i run the 800 belt too for added cooling.