I don't have any hard dyno figures, but the power:weight for these cars seems to be significantly worse than the 84-87 Civic/CRX.
I have raced with many of these at Waterford (including the 2001 ARRC winning car) and they are the only ITC car, other than a GLC or Chevette, that I can "motor" passed with my Exotic French Sports Car. The Civic more than makes up for its lack of power in the corners, however.
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Jim Krom
ITC Renault Encore EFSC (Exotic French Sports Car)