1. The business mainly operates in the United States, with its core business being the sale of performance upgrade parts for diesel trucks (such as Cummins, Powerstroke, and Duramax engines), including EGR, DPF, and CCV delete kits. 2. It is a vertically specialized segment within the automotive parts e-commerce market, with competitors including XDP, Sinister Mille, PPEI, and other professional diesel performance modification brands. 3. The brand terms used on the official website are "9PHXRacing" or "9PHX Racing".