THIS KIT DELETES THE THERMOSTAT AND COOLANT BYPASS, ALLOWING 100% OF THE ENGINE COOLANT TO CIRCULATE THE ENGINE AT ALL TIMES. USED WITH GREAT SUCCESS IN SEVERAL PRO UTV RACING SERIES INCLUDING GNCC, CMR. BITD, TORN AND MORE! THIS IS THE SINGLE MOST EFFICIENT WAY TO PREVENT HEAT SOAK AND ENJOY LOWER ENGINE TEMPS! GREAT FOR RACERS, CASUAL TRAIL RIDERS AND ESPECIALLY MUD RIDERS!