BMW secretly made a convertible E34 M5 and Z3 Roadster powered by a V-12

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BMW secretly made a convertible E34 M5 and Z3 Roadster powered by a V-12
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Celebrating 50 years of its M performance division, BMW revealed two M prototypes from its skunkworks now on display in its museum.

, and is powered by what is likely an M73 engine; the 5.4-liter V-12 was used in the 7 Series when the Z3 was in production. It produces 321 hp, a big step up from the stock M Roadster's 240 hp.

Fitting the V-12 into the Z3's engine bay was easier than it might seem. While the car itself is tiny, the engine is roughly the same length as the stock M Roadster's inline-6. It's just that there are two banks of cylinders instead of one. The heavier V-12 likely affected the car's weight distribution as well., which is part of the same museum exhibit. Based on the E31 8 Series, it has a more powerful version of that generation's S70 6.0-liter V-12 making 550 hp.

BMW M's experimentation didn't end there. It stuffed the engine from its Le Mans-winning V12 LMR race carMore recently, BMW also experimented with CSL versions of the

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