Just a few figures over the years:
1987 Sierra RS: Eggenberger 370 HP, Rouse 365 HP, HWRT 385 HP/6400 rpm;
1987 RS 500: Eggenberger 470 HP/6800 (2,8 bar), Rouse 485 HP (2,9 bar)
1988: Eggenberger 520 HP
1990: Rouse 560 HP; Bristow's Rouse-built car was quoted at 500 HP with 2,0 bar
DTM Sierra's were handicapped by air restrictors, reducing power to 330-385 HP, depending on restrictor size.
Of course, power figures are not that reliable. Especially when debating over restrictor size...
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