There's an old rumor in the German auto industry. Supposedly the heads of Mercedes-Benz
made a gentleman's agreement with Porsche
years ago never to build a true 911 fighter. All agreed the 911 was to remain the quintessential and classic Germans sports car. Over the years, BMW seems to have kept their promise as their mainstream two-door sports car, the Z4, faces off against the 911's younger sibling, the Boxster.