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BMW’s 4.4-liter Valvetronic V-8 engine produces 325 hp and 330 pounds-feet of torque. An electronic limiter keeps the car’s speed below 149 mph.
BMW’s Head Protection System combines inflatable tubular elements with a stabilizing sail for increased protection in the coupe version. Seat-mounted side-impact airbags are standard.
The seats are satisfyingly supportive, snugly bolstered — almost like cocoons — and more comfortable than their firm cushions suggests. Visibility in the coupe is acceptable, but the mirrors could be larger. The B-pillars and tapered rear quarter glass impose some limits.
The 645Ci’s rich exhaust note is most noticeable from outside the car.