The MX-5 Miata not only gets two new colors—Stormy Blue Mica and Highland Green—and a one-touch power-down passenger-side window for 2007, but a second model—the PRHT, or Power Retractable Hard Top—also joins the lineup. Mazda says the new top is the fastest power-operated retractable roof available in the United States, opening or closing in 12 seconds, and when closed it doesn’t compromise the MX-5’s 5.5 cubic feet of trunk space.