i aint to sure about if the cat is getting hot. it has the check engine light on but every time it reads a iac overspeed... and i have notice a loss of power and mpgs... down to like 10 miles a gal.. which after the tires and lift it was only at 14-15 miles per gal..so but ill check the cat tom and see if its gettin hot if not maybe ill replace the fuel regulator. and its a real pain to get cranked but once it starts and runs for a min with me holding the gas it will do fine after that.. so im lost on this stuff..... and i do believe its running rich to so u know im gonna get one tom. and put it on and see whats happens thanks