Add Porsche to the list of German marques taking time to remember the past this spring. The sports car maker unveiled a new 911 special edition called the Spirit 70 at this year’s Shanghai Auto Show. The exclusive build is a celebration of the disco era, right down to the checkered pattern on the interior upholstery. The variant is the handwork of the brand’s Exclusive Manufaktur custom division and debuts as one of the most visually distinctive 911s of the 992.2 generation. Designed to embody the essence of the 1970s and early ‘80s, the convertible is finished in a head-turning coat of Olive Neo green and features an all-black windscreen frame and soft-top roof. It also wears a crest nearly identical to the one on the 911 when it made its debut in 1963, gold badging, and an optional decal package that includes a trio of stripes for the hood and No. 70 racing gumballs for the doors...