Mosler may not be an incredibly well-known car manufacturer. But their MT900 is a fairly wild GM LS-powered supercar. Fewer than 100 seem to have been produced and sold over its decade-long lifespan.

Mosler MT900

Even less well-known, perhaps, is the car that Warren Mosler built just prior to the MT900. That car is the Mosler TwinStar. Beginning life as a regular 10th generation Cadillac Eldorado, a desire for more power (and apparently, less cargo space) led to some re-working of the body, chassis, and suspension in order to facilitate the addition of a second Northstar V8 motor with its own transmission and ignition system.

As you can see, the bodywork is almost entirely done on the rear half of the car. The frame was lengthened, with new body panels being made. The first sign of what sits behind the driver is apparent in the giant air ducts found just ahead of the rear wheels.

Of course, the question is, “How in the world did this come to be?”

Apocryphally, Mosler had his engineers working on a rear-engine setup using a similar Eldorado, as a test bed for a new “fuel efficient performance vehicle.” But allegedly, when one of Mosler’s friends saw the car in development, he pointed out how cool a twin engine setup was. From there, Mosler decided to make it happen, and thus the TwinStar was conceived.

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It appears that five total examples were built, with one customer buying three of those five. I guess it makes sense that it never went any further, seeing as there’s probably not a huge demand for such a car. The last time one went up for sale on the used market, it was listed at $39,000.

As for how the “fuel efficient performance vehicle” aspect of the initial project went? Well, not so great. The TwinStar averaged about 10 MPG when Car and Driver tested it back in the summer of 2000. It did manage to record a 5 second 0-60 time, so at least there’s that.