Guess That Car Game (By Specifications)

The Saab does 0-100 kph in 7.7 sec. so cant be him
 
I'm going to claim that, since they are exactely the values from wikipedia.
Therefore, new car:
277 bhp
162 mph
5.6 - 6.0 seconds 0-60 (varying depending on the source)
 
Was the engine originally (in Mercedes models) a 5.7L or was it modified (for instance enlarged) for this new car?
 
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