Car Porn - Chop Top Customs Pt. 2 But beyond the function of reducing the air drag on a car for running at high speeds, most cars of the era NEEDED a chop to make their lines look right. Probably no car has been more popular to 'chop' than the 49-51 Mercury coupes. Most 'Chop tops' are accomplished by lowering all of the supporting door architecture as well. However, by removing the 'pillars' altogether - you can achieve a cleaner and more stylized look. Here is that radical rendition of a 'Chop', as customized by the Barris Brothers from California Kustom Kar Kulture, the Bob Hirohata 51 Mercury remains one of the icons of Hot Rod lore.