And Spyker used the Mader engines:
Quote:
The Spyker C8 Double12R was unveiled at the Internationale Automobil Ausstellung (IAA) in Frankfurt on 11 September, 2001. The car is fitted with a Spyker-Mader 4 litre engine boasting 620 BHP without restrictors and 503 BHP with Le Mans restrictors. During recent windtunnel testing at BMW’s test centre in Munich, the car proved its excellent aerodynamics, its drag amounting to a mere 0.276
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source:
www.spykercars.com
But these are all 4L engines and Promec has a 5L so I think it's an different engine.