STILL WAITING FOR SOMEONE TO CHIME IN ON THE DRILLING HOLES IN THEIR HYFAX TUNNEL PROTECTORS FOR EXTRA COOLING. MY DEALER TOLD ME IT WOULD BE A WASTE OF MY TIME. MY BUDDY DID IT TO HIS SLED AND WE ARE RUNNING THE SAME TEMPS ON TRAIL. MINE AREN'T DRILLED YET. AS BROCK SAID, IT CAN'T HURT. ALTHOUGH I'M STARTING TO THINK IT MAY BE A WASTE OF TIME? IF IT WORKED GOOD I'M SURE SOMEONE WOULD HAVE GAVE THE THUMBS UP ON HOW IT HELPED WITH TEMPS BY NOW?