While BMW was revealed to have been making a bonafide go at an M8 variant of the big grand touring coupe back in the early ‘90s—and in fact the company’s sole box-flared beast of a prototype still exists, complete with carbon-fiber wheel covers—that car never made it to the masses, or at least to that portion with the taste and means to acquire such a car that would have likely carried an MSRP somewhere in the Ferrari territory it was aimed at.
Luckily for those people though (and for the second and third and fourth owners), M still left some incriminating fingerprints on the 8-Series, and as with most stews stirred by its hand, the result was an unmatched vessel of prowess that they simply called the 850CSi.
At the time of its reveal in 1992, the peer group for this car was almost nonexistent. On a more abstract scale, there have been very few in its wake to attempt a similar blend of substance and poise. It never claimed to be a sporty coupe, yet it could outperform many of them. The car’s true domain however was a lengthy trip with the room to show off how comfortable 100+MPH can be; this was the kind of car whose essence was understated, yet its presence never went unnoticed.
Though any form of the E31 chassis was and is a genuine rarity, the CSi stood even further apart. At the time, this was the end-all, be-all, the award-winning stew of a high-tech ecosystem paired to a taut motor that could push the impressive package well past the imposed safety speed threshold of 155 MPH. Further boosting the desirability of the CSi model was the inclusion of special staggered forged M-System wheels with the distinctive “throwing star” bladed covers, a more robust and direct suspension, extra interior options, and a host of upgrades to the exterior paneling, as is the fashion for cars with the M treatment.
It was a truly special car, and its production run reflected that. Exorbitantly expensive, and unable to continue production in line with updated emissions standards, only 1,510 units of the model were produced the world over. And to add enthusiast clout to such rarity, each of these cars came fitted with a six-speed transmission bolted to the back of a 5.6-liter V12 stamped with the fastest letter in the alphabet.
The 380-horsepower heart that resides under the hood of Patterson’s—and every—CSi has an interesting family history, and can claim to this day its title as the rarest production engine in a BMW road car. In a reversal of the typical German logic, BMW’s M-tuned and -built motors will often trade their “M” designation for that of an “S.” Such is the case with the S70B56 found in the CSi. Variations of this motor—which was essentially a pair of straight-sixes fused together—would go on to win the 24 Hours of Le Mans outright, in both the McLaren F1 GTR, and in BMW’s own V12 LMR.