Introducing a heavily-refreshed lineup of luxury products in 2003, Lincoln has provided a series of more modest changes for 2004. With the Cartier trim level gone and Ultimate trim added for 2004, the Lincoln Town Car as well as the six-inch longer Town Car L model also adds rear detection system as standard on all version of the flagship. The 2004 Lincoln LS is enhanced with new suspension tuning engineered to lessen road noise and vibrations. AdvanceTrac with Roll Stability Control debuts as available equipment on the Aviator and Navigator. Both Lincoln sport utility vehicles also add tire pressure monitoring for 2004 as a standard feature for increased safety protection. Satellite radio is presented on the LS and Town Car as a dealer-installed option.