The best choice to improve you car would be to fix the Mercury Grand marquis side skirts. If you want to modify your car so that it looks r too closer to the ground, you can fix these Mercury Grand marquis side skirts to the sides of your car. These are in commonly the strips of carbon fibre, plastic or fibreglass that are usually tending to match with the default body stripes of your Mercury Grand marquis and their attachment and fixing can be done in an blink of an and also enables you to use mutually with rear or front bumpers.