2009 Arctic Cat Prowler 550 H1 EFI, runs good. - PROWL FOR VERSATILITY. Valleys. Peaks. Wide open spaces. When the outdoors is calling, answer it with this meaty machine. At its core is a liquid-cooled 550 H1 EFI engine capable of taming almost any terrain. And at its rear is a flatbed with a 2.5-inch lower floor and deck height for easy in-and-out loading. Add the optional stake sides and you get even more versatility.