It turns out Toyota Motor Corp. isn't as strong as it appears in at least one area -- under the hood. Testing under stricter new horsepower standards reveals that most of the models in Toyota's lineup have less oomph than the company has advertised. Even though the engines are unchanged, the automaker had to lower the horsepower ratings on all but few 2006 Toyota, Lexus and Scion models. The reductions range from 4 to 20 horsepower compared with 2005 models. Honda Motor Co., the No. 2 Japanese automaker, also has downgraded the horsepower ratings on several models, including most of its Acura luxury brand.