Hardly had we reported that Speed-Buster released a chip tuning upgrade for the BMW M850i Coupe that the tuner came out with a similar package for its diesel-powered counterpart, the 840d xDrive.
Even in its stock form, the twin-turbo inline-6 diesel churns out respectable 320 hp (239 kW) along with 680 Nm (502 lbft) of torque. Once you install and configure the Speed Buster CTR Tuningbox, these figures go up to 365 hp (272 kW) and 763 Nm (563 lbft).
The car must now be capable of performing the standard sprint in less than five seconds, as opposed to the 5.2 secs of its non-tuned counterpart.
Photos: Speed Buster