• MEXICO CITY • Feb 20 (Reuters) • Mexico's armored-car makers predict 2007 will be a record year, their business boosted by reports of severed heads and heavily armed drug gangs murdering police. Mexico counted more than 2,000 gangland-style killings last year, including grisly decapitations. Killings in northern and western states have continued at the same rate this year.Sunny, friendly Mexico... where Kevlar is King.