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Originally Posted by Mr.Vercetti
The M3 GTR had 400bhp(the street version).
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I remember when they had that car racing for American Le Mans Series, I think it had the 4.0 liter V8 in there. Because I remember the Porsches bitching about how the M3s had two extra cylinders and it was not fair. So I don't think it is the S54 is the 400hp version.
On another note, keep in mind that reliability becomes an issue when you are talking about production cars.