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Trade them out for adjustable airbag units available at a local auto supply store or from an online auto parts seller.  In addition to installing the airbags to replace the springs, this method of lowering your car also requires installation of air lines, an air compressor, air reservoir tank and system activation switch.  This process can be done at home.  If you have rear leaf springs, you will need to get rid of them and replace them with a 4 link setup. This process usually needs a professional fabricator.
Replace the springs and shocks.