style cars. These were straight from the 928S4, which was slated to debut a few months later. These changes came starting from VIN 1001, which means that the first thousand 1986 cars had the old brakes, but later cars had this equipment available. This later 1986 model is sometimes referred to as a 1986 or 1986.5 because of these changes. The name is a little misleading as more than 3/4 of the 1986 production had these updates. The 928 S4 variant debuted in the second half of 1986 as a 1987 model, an updated version of the 5.0 L V8 for all markets producing , sporting a new single-disc clutch in manual transmission cars, a larger torque converter in automatic transmission cars and fairly significant styling updates which gave the car a cleaner, sleeker look. S4 was much closer to being a true world car than previous models as the only major differences for North American models were instrumentation in either kilometers or miles, lighting, front and rear bumper shocks, and the availability of catalytic converters in many other markets. The Australian market version was the only one with different horsepower rating at due to preparation for possible low grade fuel. Even this was achieved without engine changes. A Club Sport variant which was up to lighter became available to continental Europe and U.S. in 1988. This model was the toned down version of the 1987 factory prototype which had a lightened body. Also in 1987, the factory made five white lightweight S4 models with a manual transmission for racecar drivers who were on their payroll at the time (Derek Bell, Jochen Mass, Hans Stuck, Bob Wollek and Jacky Ickx). These were close to same as later actual Club Sport models and can also be considered prototypes for it. An SE (sometimes called the S4 Sport due to model designation on rear bumper), a sort of halfway point between a normally equipped S4 and the more race-oriented Club Sport, became available for the UK market. It's generally believed that these cars have more power than the usual S4. They utilize parts which later became known as GT pistons, cams and engine ECU programs. Some of them had stronger, short ratio manual transmission. The automatic transmission was not available for this model. For the 1989 model year, a visible change inside was digital trip computer in the dashboard. At the same