Cat made a boatload of new changes to their race sled for this year and a recent press release detailed all of them. For the sake of space we have tallied them here.

New Chassis Geometry – Added ground clearance improves predictability through the huge holes and allows the rider to attack the track while scrubbing less speed.
-    1.35 in. added ground clearance at foot pockets
-    Flatter running board angles
-    Single layer .080 in. thick tunnel for increased strength
-    New rear suspension mounting positions give track drive more ground clearance

New front suspension/steering geometry
-    Improved caster angle
-    Increased ski stance to 43.5 in. (1.2 in. wider than 2012)
-    New steering ratio for sharper turning radius
-    New ski damper loads rear of ski for improved handling
-    New front arm shock eyelet for improved durability

New rear suspension – Both the front and rear suspension changes improve steering and control while on the gas.
-     Front arm mounting position moved rearward 2 in. to improve transfer control
-    Increased Front arm suspension travel (approximately 1 in.)
-    Added strength to both front arm and idler arm
-    New Torsion spring for increased preload
-    New rear coupling position, gives a wider range of adjustment

Drive system updates
-    New PTO engine plate for durability
-    Increased stiffness in engine mounts
-    Modified dropcase for more strength
-    New lightweight/high strength track drive shaft
-    New driven shaft with increased durability
-    New drive clutch spring
-    New drive belt

New Hayes Race Brake system
      -    New brake caliper and disk
      -    Increased fastener size holding caliper halves together to decrease flex
      -    New deeper pistons to eliminate caulking
      -    Machining updates to improve bearing retention
      -    Increased ports for improved flow
      -    New seal groove for improved piston retraction

Other Items
      -    Heated 40mm Mikuni rack style TM carburetors w/TPS
      -    New 1/4 turn assembly, hood pin, and hold down strap to secure side panels
      -    Added thickness to Snocross snow flap
     -    Modified front heat exchanger engine mount bracket for increased durability
     -    Updated wire harness for improved routing
     -    New throttle cable with increased temperature rating
     -    New choke cable
     -    Snocross seat has narrower (1.5-in. each side) leg profile than Cross Country seat
     -   Snocross has low-height windshield and Cross Country has mid-height
     -   C&A XT Snocross or C&A ADX Cross Country Ski  (Carbides NOT included)
     -   New Team Arctic Green color