my S2000 is bone stock motor-wise and I just dyno'd it to get a baseline before I turbo it in a couple months. here's the dyno of mine and my buddy's. my buddy has intake, header, and test pipe tuned with AEM, we're putting a supercharger kit on it this weekend so I'll post the new dyno in a week or two
anyway if you look at my dyno round it off and it's 205whp, that's only a 14.5% drive train loss based on a 240hp stock number. that's really good compared to a lot of other RWD cars, most are about 20% lower at the wheels from the advertised flywheel number. I think part of it is manufacturer's lying to advertise better numbers but Honda doesn't do that. the Mazda RX-8 used to advertise 250hp until they got involved in a class action lawsuit because guys were only dynoing 190whp, now they advertise 232hp
215whp on a bone stock F22, not on the dyno we've been using

always look at the dyno manufacturor when comparing numbers as they all give slightly different numbers. Dynojets are the standard (since they invented the dyno

) but they even vary slightly between models. Dynapacks are the worst since they try to estimate flywheel HP, guys love to post those dyno's since they'll be exagerated compared to any other dyno.
anyway the S2000 motor is an awesome motor, just looking at what guys are doing with turbo kits and running 400whp - 500whp with nothing done to the motor or just a headgasket to lower the compression is pretty cool.