Convertibles are generally heavier than the coupe version because they have to do lots of reinforcements for chassis rigidity....but them bimmers aren't slow. I've always like bmw over mercedes for performance. Mercedes are just freakin sick on the inside.4drmadness wrote:haha those beemers are crazy fast bro. tht heavy *** 6 series can outdo my dads clk 500 which is a convertible.