I don't think BMW is upping the HP to "keep up" with the MS. The HP increase with the new boxer is just a product of the improved technology that comes with the water cooled motor. If BMW wanted a 150hp boxer I think they could do that right now and they haven't. I don't think most people are shopping both a MS and GS as serious alternatives. The MS is an upright sport bike and the GS is the Swiss army knife of bikes. If they were shooting for the same purpose and functionality then I would have to get rid of either my GS or MS. I think they actually compliment each other quite well.