The M stands for More in the updated 2022 BMW X3 M Competition. The top tune of the performance crossover dials up 503 hp and 479 lb-ft of torque from its turbocharged inline-6 this year, representing 37 lb-ft more than last year’s model. More is better. The 0-60 mph time drops from 4.0 to 3.7 seconds, which is the same as the twin-turbo V-8…