the JDM EDM ADM engines have higher compression than the USDM (11.1:1 vs 10.6:1) this and the fact that they have higher octane fuels available (98 octane) allows them to pull slightly higher numbers out of their engines... i have seen JDM ITR engines rated as high as 210HP stock... this is normal everyone uses different scales to rate HP (HP, PS, kW, etc...) i guess this could be a reason for some of the differances in reported numbers too... i wouldnt concern yourself too much with the HP numbers you hear... if the engine specs are the same the output is most likely the same as well