Ever since VW acknowledged installing so-called “defeat devices,” in its diesel vehicles, there’s been speculation about just how deep the problem might run. The EPA officially widened the scope of its investigation yesterday, when it stated that six-cylinder vehicles from Audi and Porsche, including the Porsche Cayenne, were designed to deceive regulators about their emission levels.

Specifically, the EPA alleges that “VW developed and installed a defeat device in certain VW, Audi, and Porsche light duty diesel vehicles equipped with 3.0 liter engines for model years (MY) 2014 through 2016 that increases emissions of nitrogen oxide… up to nine times the EPA’s standard. The vehicles covered by today’s NOV are the diesel versions of the 2014 VW Touareg, the 2015 Porsche Cayenne, and the 2016 Audi A6 Quattro, A7 Quattro, A8, A8L, and Q5.”