Odd numbers are for sedans while even numbers are for coupes. The 4 Series replaces the long-running 3 Series Coupe, as well as 3 Series Convertibles. While most will think it's merely a 3 Series with the rear doors taken out, the 4 Series is actually lower, slightly longer and wider than its four door brother. If you find the shape of the 4 Series coupe appealing but need extra doors, there is also a four door Gran Coupe that retains the 2 door's profile.

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