My friends 3rd Gen Camaro has just one cat. It's fucking big too lol.
the camaro is single exaust into the muffler then splits back to dual tips at the muffler the turbo car im guessing is a single kit and its single pipe back into a y pipe to the dual exaust so in both cases all the exaust is comming threw the single cat on a stock style mustang u cant do that witch equals not right