One of the highest specific output spark ignition engines ever produced for a street car (181hp per liter of displacement), the M133 engine has few equals, but there is still room for improvement. Utilizing proprietary electronic circuitry, the K-Box elevates the power output of the 2 liter turbo engine to an eye watering 420 HP and 540Nm (398 lb-ft). Installation is straight forward, requires no special tools and takes under 20 minutes. User adjustable power trim settings allow the individual to tailor power outputs to their personal tastes. No permanent modifications are required for installation, switching back to OE takes a matter of minutes.

45-K1: K-Box. Up to 420 HP and 540 Nm (398 lb-ft) of torque.