It seems that even though the X5 M and X6 M are moving quite a few models, BMW is keen to exploit the performance diesel fans, and is preparing to launch a tri-turbo diesel engine at the 2011 edition of the Frankfurt Motor Show.
The new units are rumored to grace the X5 xDrive45d and the X6 xDrive45d, and will be marketed as performance models, with the engine outputting over 350 HP. It is also expected that technologies such as Auto Start Stop or the brake energy regeneration one (KERS) will be implemented in the SUVs at that time.
BMWBlog is also saying that subtle cosmetic touches will be made to the new variants, in order to distinguish them from the rest of the models, but not as aggressive as the X5 M or the X6 M ones. The new engine will first find its way onto the X5, arriving on the X6 at a later date, but will also be featured after that on the new 5 and 7 Series.