Good one, I actually have parts from my M106 engine for sale on here. There are probably a few dozen of these cars on the streets in the US, many more have been wrecked and crushed before anyone ever knew what the cars were. But yeah, the 745i Turbo which was made until about 1986 was the last production turbo. Mine is a 1984 model with the M106 engine that has about 275 horses untuned. With an adjustable WG, you can get about 330 or so very conservatively out of that motor without any other mods.