Mustang rear seat deletes are one of the most popular ways to remove excess weight. Removing your rear seats in your Mustang helps reduce your car's overall weight and increase your speed. Most people tend to do a rear seat delete after installing aftermarket seats because the current stock rear seats do not match the aftermarket front seats. It also helps to reduce weight when adding aftermarket seats and doing a rear seat delete together. Another more common reason for doing a rear seat delete is the use of installing a roll cage.