Quote from the BMW M Registry - " After having been discontinued for more than six months, a revised M coupe entered production in February of 2001. All three versions (European-spec/LHD, European-spec/RHD and North American-spec) utilize the
S54 motor from the E46 M3. "
" The
S54 powerplant of the later M coupes is technically an evolution of the iron-block
S50 B32 unit that is found in later European-spec E36 M3s, as well as all European-spec M roadsters and M coupes built through June of 2000. The two motors develop similar peak power ratings: 321 hp (DIN)/315 hp (SAE) at 7,400 rpm and 251 lb/ft of torque at 3,250 rpm for the S50 versus 325 hp (DIN) at 7,400 rpm and 258 lb/ft of torque at 4,900 rpm for the S54. "
So I would have thought that the M Roadster with the S54 engine would conform to the figures above, not the figures you have quoted in your post as they are for S50 engine we have in Europe.
Hope that helps.
BMW M Registry - FAQ E36/8 M coupe