That's right an M550. I have the only known 1990 535 12cyl that was converted by the PTG group in 90. I have owned the car for 6 years and have the complete service history. The car looks like identical to an M5 on the outside (93wheels), but has a 1989 12cyl engine/trans/brakes and M5 suspension. The car is off the shelf BMW parts except the B&B exhaust system. I am asking 22300.00 for this perfect 93000mi car that can't be copied for less. This car is well, fast considering the 535 3.91 rear end coupled with 332lbs of thrust. I have and had other 12cyl's and this is a street rocketship. Just right in size and an automatic to haul my lazy butt around town. I am selling because I don't have the time to drive this car that often. No sense in letting it sit around. If there is any interest email me. Doug