There are a lot of things a vehicle needs that do not come stock on the vehicle... Why is that still being used as an argument?!? Its like saying DEF fluid came stock on tractor trailer trucks and is therefore better/needed for the trucks to be reliable and increase longevity. NO it isn't, it is just required to pass the crazy emissions requirements. The multiple catalysts and fluid setup can actual cause major issues if not properly maintained. Just because an engineer from GM didn't put a catch can on the car, does not mean it shouldn't have one. There's lots of things on the cars that aren't necessary and lots of things missing that a car could use. /endrant catch can arrives tomorrow
