The rumor mill around Subaru’s performance division has been working overtime lately. Fans of Subaru Tecnica International have spent months chasing reports of a returning WRX STI hot hatch, but the company may also be working on a new sports coupe with a proper STI variant attached.

 

According to CarSales, Subaru has trademarked the ACX and ACX STI nameplates with IP Australia, a callback to the ACX-II concept car from 1985. The Australian outlet leans toward a gasoline-powered application, pointing to separate “Flat Shift” and “Rev Sync” filings as supporting evidence. However, trademarks lodged elsewhere in the world tell a different story.