Original name: ホンダ シビック Si セダンコ ンセプト Honda Civic Si Sedan Concept Unveiled at Chicago Auto Show 02/08/2006 - CHICAGO The Civic Si Sedan Concept is making its debut at the 2006 Chicago Auto Show, American Honda Motor Co., Inc., announced today. The Civic Si Sedan Concept provides strong hints of the styling and performance for a production Civic Si Sedan scheduled to go on sale this fall, marking the first time that "Si" performance has become…