Later this month, BMW plans to debut their new M4 Convertible for 2015. Along with the M3 Sedan and the M4 Coupe, BMW’s M4 Convertible will sport a new inline-six M TwinPower Turbo 3.0 liter engine good for 431 horsepower, a 0-60 MPH time of 4.2 seconds, and a top speed of 155 MPH. The car’s main attraction is its hardtop, which can effectively fold away in around 20 seconds.
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