Never mind, I see. There was apparently a 400ish-pound gap between a Euro-spec model and a US-spec model. That 8:32 lap time makes sense now, considering the 928GTS's estimated lap time is only a second slower. A lot of the 200-250hp sports compact cars ran similar lap times.
If, indeed, the 545i weighed 1,680 kilograms (driver included) with 333 metric horsepower, then this car is basically in the middle of E500 and E55 AMG in terms of performance.
545i- 1680 kgs, 333 hp = 198 hp / ton
E500- 1700 kgs, 306 hp = 180 hp / ton
E55 AMG- 2005 kgs, 476 hp = 237 hp / ton
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