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Edmunds: Cadillac CT4-Blackwing vs BMW M3 sport sedan battle

This photo provided by BMW shows the BMW M3, a small luxury performance sedan with a 473-horsepower turbocharged six-cylinder engine. It offers the option of all-wheel drive and a zestier 503-horsepower engine. (Uwe Fischer/Courtesy of BMW of North America via AP) This photo provided by Cadillac shows the Cadillac CT4-V Blackwing, a small luxury performance sedan with a 472-horsepower turbocharged V6 engine. It provides excellent performance value for the money. (DW Burnett/Courtesy of General Motors via AP)