9R Big Bore kit for Polaris 850.   
 
Kit Contents:
OEM 9R Pistons
9R OEM Cylinder
9R High-Flow Y-Pipe
9R Powervalve Assembly
All Required Gaskets
SLP Billet 9R Head 
Indy Specialty Polaris E-VES alingment tool
 
Burandt's custom clutch kit available for an additional $550 (comes with adjustable weights, primary spring, secondary spring, roller bearing and custom helix).