Easy to install. You need to go to the Mishimoto website for the installation instructions as they are not included with the product. Also, several others have commented on removing about 3 inches from the heater core return hose, which needs to be done. I took some photos of how I routed and clamped the hoses as this was not mentioned in the instructions. I used 3/4" hose clamps and a 1/2" clamp on the negative battery cable. Some may route it differently, but it is double insulated with aβ¦