BMW tuner Racing Dynamics of Italy in 1991 produced a special version of the 8 Series dubbed the K55 Sport Coupe taken from the standard production line. The K55 5.5 Coupe was based on the 850i, powered by the 5.0-liter M70 that was stroked to 5.5 liters, new valves, camshafts lifters and intakes along with extrude honed heads. The one US version engine producing 475 bhp (354 kW; 482 PS) and the Euro version producing 401 bhp (299 kW). 40 K55s were produced for the Euro market and one in the US. In addition to engine modifications, The K55 offered a variety of body, suspensions, rear end options. [11][12]
However, there is no verification of 475 hp (354 kW) produced by this car by Racing Dynamics. The K55 produces 380 hp (280 kW) and 405 ft·lbf (549 N·m) of torque as listed in the 02/1994 Euro car magazine. Racing Dynamic's own website lists the K55 at 401 hp (299 kW).[13]
The 475 hp (354 kW) was declared by Autothority (as listed in the said Road & Track article) who are no longer in business in their original capacity. The 475 hp (354 kW) claim was never verified.
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