Walter Röhrl is 64-years old. That makes him a retiree, which is richly ironic as the Bavarian is generally regarded as the greatest driver alive. Although Röhrl never raced F1, he did compete in the Group-B rally era and has of late been the man chiefly responsible for finessing Porsche’s road cars. Suffice to say – no Porsche gets the production go-ahead without Röhrl’s approval. Not bad for a guy who started out as the Bishop of Regensburg’s limousine driver in his teens. Although Röhrl should have exchanged his driving shoes and gloves for a pair of loafers and the daily newspaper’s crossword puzzle page years ago, he is still going strong. During the recent international media launch of Porsche (very) long-awaited Cayman R, the master was on hand to entertain the journalists present with some world-class car control at the helm of perhaps the rarest, and certainly most beautiful, Porsche of all – the 904 GTS.Despite having professed his deep admiration for the company’s contemporary GT-series 911 models, the 904 remains Röhrl’s favourite Porsche of all time. Powered by a mid-mounted 2-litre flat-four engine producing 148kW in standard trim, the racing versions weighed less than 700kg. Performance was startling (0-100km/h in six seconds dead, top speed near 260km/h) and even today it is regarded with great reverence by Porsche acolytes the world over. Porsche even offered a few cars with six-cylinder engines which became available as 911 production came on-line in late 1963. Check out the clip below and admire the perfect fusion of man and machine as Walter Röhrl pushes the 904 to its limit.