The 2003 Hummer H1 is available as a 4-door, 4-seat sport utility. Starting at $105,160, the 2003 Hummer H1 Open Top is powered by a 6.5L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2003 Hummer H1 Enclosed, priced at $116,483, is powered by a 6.5L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated