Autobox consistency at play there, also makes better tv. Most importantly don't forget potential, we have a smart full lock differential, and the wheel arches to run much larger tires. With a $500 chip they'll both have the same power but the 1m's ability to put that that power down in a variety of conditions is superior, I run a few mods that give quite a bit more power, jb4 g5, fill it with e85, and to a lesser extent an intake and midpipes, an extra 150hp, what could an m135i due with that power? I run 295's in the back with no rubbing and the power overwhelms the tires if I don't limit boost in the low gears, no hope for the m135i; I'm beyond happy with our cars.
BSM 1M, Motion Control Coilovers, JB4 G5 ISO, BMS E85 Flash, ECS CF sealed intake, N54 Tuning DP's, N55 Mid Pipes, Evolve Race Midpipe Back Exhaust, Wagner FMIC, Stett CP w/ Tial BOV, CDV, Performance Steering Wheel, Big Tires on CH-R's.