a cat will not cause stinky white smoke. but a blown head gasket will. you might want to ask someone who actually knows what hes talking about before you cause more damage to the car if it is the head gasket.
who ever told you that you need a cat is a dumbass, white stinky smoke is symptom of a blown head gasket, go and get a leak down check, and get a compresion check , also check your spark plugs and see if they are kinda wet or a substance that has a green tint to them
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