In terms of engine mods, the JCW features reinforced pistons, a lower compression ratio (10.0:1 versus 10.5:1 in the Cooper S) and more boost (1.3 bar in the JCW, 0.9 bar in the Cooper S) from a larger turbocharger and exhaust manifold. A larger cold-air intake and mass airflow sensor are also fitted to improve throttle response. Finally, a reworked exhaust system produces a genuinely mean sounding note, that barks and burbles on overrun. All that mechanical nonsense means there’s 208 horsepower and 192 pound-feet of torque (207 pound-feet during overboost) at the disposal of your right foot.
