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3 cats, I had 4 on my Mustang, but now I have 0. Helps out some.y04gt said:Is not that they are monsters with i/h/e, is just that those cars are very restricted from the factory and with those mods they feel a lot diferent that a stock one. My cousin has a 2005 V6 Tibby and the exhaust system has 3 cats, he put a catless exhaust system, i/h and the car is a lot faster than stock.