Communities from Pacific Palisades to Pompano Beach will quake with enough excitement to register on the Richter scale when word of the 2007 Mercedes-Benz GL-Class spreads among the nation’s affluent. The debut of the GL-Class brings to four the total of Mercedes-Benz SUVs, from the sport-tourer known as the R-Class to the rough-and-tumble G-Class. After the initial rollout of the new GL450, Mercedes will offer a GL320 version with its new Bluetec diesel engine, which runs on low-sulfur fuel and cuts 80 percent of the nitrogen oxides normally found in diesel exhaust. The Bluetec version will meet air quality standards in California and New England, two of the strictest regions on the planet.