Chevrolet Lumina SS 2007 Manual Gasoline mileage: 36 KM Full electronic catback, premium detailing. It is 3 inches in size. It ends with the agency's mufflers and hidden outlets before the mufflers, which you can control with a remote. The advantage of the catback is that it has no back pressure, and you can step on it even when the mufflers are closed.. and the openings are hidden, meaning they are not visible from the back of the car. It fits Lumina or Caprice.