550 Cat rebuild in the Yukon will set you back $60 grand, just to stay away from all this electronic garbage that is out there, but your life can depend on it when a sensor goes south when it's -50 0n the Demster Hwy. Well worth it. A friend up there told me if the company wanted him to buy a new truck, he would quit driving, been hauling to Inuvik for 35 yrs.