The fun-size BMW 2-series is an entry-level luxury car with big thrust. Sold as a coupe only, the 230i and M240i have vastly different power levels, but are both offered with either rear- or all-wheel-drive. Although it’s grown in size, its rear seat space is smaller than before. However, the most important aspect of the 2-series remains true in this generation: it rewards spirited driving at a reasonable price—particularly in four-cylinder, 230i form.