The Subaru Impreza WRX STI is high performance specification model of the Subaru Impreza compact car line, manufactured by Japanese automaker Fuji Heavy Industries Subaru.

In relation to international motorsport governed by the FIA, Group N refers to regulations providing "standard" large-scale series production vehicles for competition. They are limited in terms of modifications permitted to the standard specification by the manufacturer making them a cost effective method of production vehicle motorsport. Often referred to as the "showroom class", Group N contrasts with Group A which has greater freedom to modify and tune the cars to be more suitable to racing. Both groups may have the same or similar models homologated by a manufacturer.