for guys that are worried about I4 turbo engines power.. I have APR stage 1 tuned VW GTI makes about 290 ft-lb torque and 250 hp at the crank.. its got plenty of power and very fun to drive. Im sure BMW can make a turbo 4 - M2 that is about around the weight of current 1m or less.
imagine current 1m (suspension, body, chassis, etc) w/ e30 m3 engine slapped on with a turbo... excited : ) Newer and tweaked of course. If BMW was able squeeze out 200 hp out of N/A 4 banger in 1990. I dont think we should be worried about BMW's ability squeeze out ~300 hp out of turbo 4 banger in 2013