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Eastern Idaho diesel parts companies and owner agree to pay $1 million after pleading guilty to selling and installing illegal defeat devices

Diesel performance parts retailers GDP Tuning LLC and Custom Auto of Rexburg LLC, doing business as “Gorilla Performance,” as well as the companies’ owner Barry Pierce, pleaded guilty to criminal charges Wednesday in federal court in Pocatello and agreed to pay a total of $1 million in criminal fines, announced U.S. Attorney Josh Hurwit. 

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