The man behind a massive nationwide catalytic converter theft ring has pleaded guilty to federal charges, admitting to stealing thousands of converters and making over $600 million between 2020 and 2022.

The scheme: Navin Khanna, 41, from New Jersey, ran D.G. Auto Parts, an operation that bought stolen catalytic converters from across states like Oklahoma and Texas, then resold them to a refinery for big money.

• Police say the operation grew after noticing a big spike in catalytic converter thefts in Tulsa, Oklahoma.
• Khanna used the money from reselling converters to buy luxury cars, real estate, jewelry, and gold bars.
• Search warrants in several states turned up $4 million in cash and over 200 pallets worth of catalytic converters.

More than 20 others are charged in this case, with several already pleading guilty. Together, the group has agreed to give up millions in cash, land, cars, and other assets, according to the U.S. Department of Justice.

What’s next: Khanna faces up to 17.5 years in prison. Sentencing will be decided later in a federal court in California.