in continuation of @toofasts reply....
Performance Characteristics
Because of their powerful engines, Grand tourers can still compete with many sports cars in top-speed and acceleration. However, in terms of handling they are a magnitude below sports cars, because of their weight and many times the softer suspension. Grand tourers excel at high speed, long distance travel or races and make more practical daily drivers than sports cars.
Classification
In certain professional motorsport classifications, such as the FIA, It defines a GT car as "an open or closed automobile which has no more than one door on each side and a minimum of two seats situated one on each side of the longitudinal centre line of the car; these two seats must be crossed by the same transversal plane. This car must be able to be used perfectly legally on the open road, and adapted for racing on circuits or closed courses." Using the above definition, it is still valid to place sport cars such as the Corvette and the 911 in the grand touring category since they do contain many, if not all, the amenities of a grand tourer. However, this weakness in motorsport classification sometimes blurs the line of what is considered a true production grand tourer, and may lead to mis-classification.
