The horsepower is a characteristic that most of drivers attach the greatest attention to. In this case, it is the BMW, that has by 133 percent more horsepower in comparison to the Porsche 911 930 Cabrio, which makes this car really faster. Because of more horsepower the BMW 6-Series E63 should also provide distinctly better flexiblility in specific speeds.
The width of the car influences directly on passanger's inner room and driving stability. The BMW 6-Series E63 M6 Coupe E63 5.0 V10 507HP automatic is 194 mm wider in comparison to the Porsche 911 930 Cabrio. It is often clearly perceptible by driver and passenger in front, who have more room for their elbows.
BMW 6-Series E63 M6 Coupe E63 5.0 V10 507HP automatic has 22 percent longer wheelbase than the Porsche 911 930 Cabrio 3.2 218HP. A longer wheelbase gives more stable and comfortable ride, especially when driving fast. It also provides more storage space. However, cars having a longer wheelbase will not be as maneuverable as those with a shorter length between its axles.
The BMW 6-Series E63 is 13 % longer than the Porsche 911 930. Long cars have more interior space and usually have more storage space. Although the BMW 6-Series E63 M6 Coupe E63 occurs to be better for families or persons who value comfortable rides, the Porsche 911 930 Cabrio may appeal to city drivers as it will not cause problems with parking and will be more maneuverable.
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The higher a vehicle is, the better is the comfort of getting in to it and greater possibility of loading big amount of stuff to it. The difference between these two cars of 3 percent in favor of the BMW 6-Series E63 M6 Coupe E63 is insignificant and should not be really noticeable.
Automatic transmission which is installed in the BMW 6-Series E63 despite having a few disadvantages offers much more better comfort of driving. After a long time spent at the steering wheel the driver is less exhausted. Also automatic puts less strain on the engine because of the factory settings of changing gears in specific revs range.