rules. As the naturally aspirated BMW Coupés and Ford Capri had pulled out of the Div. I (over 2.0 litre) of the DRM, these Porsches had no serious competition in the big division until other turbo-charged cars like the BMW-powered Schnitzer, Toyota Celica and the Zakspeed Ford Capri debuted. The DRM was a drivers' championship, and with equal Porsche customer cars, no other competitor could dominate, which meant that despite the customer 934 of 1976 and the 935 since 1977 dominating their division, the championship was often decided in favour of a small division pilot. Kremer went on to develop yet another special 935, the K2, and also ran the optional 3.0L engine offered by Porsche, which was connected with sixty kg more minimum weight. Porsche also sold slightly modified customer cars in 1978 and 1979. 935/77 works After having won both world championships in 1976, Porsche focused on Le Mans. Due to a lack of competition in 1976, Porsche decided not to defend its sportscar championship with the 936 in 1977, leaving it to the Alfa Romeo Tipo 33. The series would be demoted to a European series in 1978 before being discontinued. In the 1977 World Championship for Makes season, the factory continued to develop and race one or two new 935, in case BMW or another brand would bring a competitive turbocharged car. Customers of the 935/77A were not happy that the factory would race them with a newer car, but as the 935/77 was often unreliable, it won only four of the nine WCM events, which did not include Le Mans. In the WCM season opening 24 hour Daytona, the old car was entered, but tyre failures caused a DNF, with an old RSR taking the win in front of two customer 935. The new car body was changed significantly to lower drag, resulting in a 10 km/h higher top speed at Paul Ricard, where it covered 3,500 km in tests at speed, lapping three to four seconds faster. The front fenders, which in 1976 had followed the hood, now protruded above the hood line, and also accommodated mirrors. The rear fenders were altered, but the biggest change was the addition of a second rear window above the standard one. This allowed cleaner air flow to the rear wing under which the single turbo was later replaced by two KKK units. This improved throttle response and