Catalytic converters are incredibly expensive. Finding a used one can help reduce costs, but only by so much. There are two ways to analyze which cars are the more valuable target: catalytic cost and quantity. Cars that have two converters (the Prius is not alone here) are often considered worth the risk because they are double the money. The Ferrari F430 and the Lamborghini Aventador top the list when looking at both; The F430 CC each costs around a whopping $3,800 while the Aventador’s pair cost $3,100 each. The Ram 2500 only has one, but it runs $3,460. To break down the model and cost for the rest of the list, we turn to The Grumpy Mechanic’s handy dandy chart: