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A used good shape S4 motor isn't that much different in cost from a used good shape Euro S2, and the LH 2.3 brain of the S4 has decent knock detection.
OTOH a simple low boost blower like the Eaton with a custom box intake might do very well on a Euro S. Fatten up the low end, maybe do around 400 rwhp, hard to say.
I'm expecting this stock Euro S2 with a Y pipe and high flow cats to be in the 270 rwhp area. Once I have a feel for what that is like, then I will figure out where to go next.
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