XM Satellite Radio announced that Acura is expanding availability of factory-installed XM radios throughout its 2007 model-year line. According to a Sept. 13 release, XM is standard equipment on all Acura models. In addition, Acura will offer XM Navtraffic for four of its top-selling models: the 2007 Acura RL and TL luxury performance sedans and MDX and RDX luxury SUVs.