Aerodynamic science is lost on the Lincoln Navigator, so wind noise is a given. Get this hulk up to speed on the freeway, and the atmosphere makes itself known around the mirrors, the windshield pillars, and if you've got the sunroof open, the hole in the roof, too. Road noise, however, is well isolated, and while the stiff suspension transfers plenty of shock to the cabin it doesn't clank and thunk like some crossover SUVs. Lincoln's THX-certified audio system sounds terrific, easily drowning out aural irritants with rich sound quality.