He led the world's largest company selling software to defeat air pollution controls on diesel trucks. He has been sentenced ...

Whereas nearly every big-name diesel tuner in the U.S. sold EGR and DPF deletes ... Those are the ones that often make their way back to PPEI in need of repair, according to Willis.

Kory Willis is the founder and lead tuner at PPEI, one of the United States’ most prominent diesel performance outlets. He made a name for himself and his company—particularly in the GM ...

Willis, 35, and his Allen Parish company, Power Performance Enterprises ... Willis founded PPEI in 2009 to provide software to allow diesel engines to run without required pollution control ...