In the world of grassroots motorsport and JDM performance tuning, few platforms have exploded in popularity as rapidly as the Toyota Yaris (XP210). Specifically, the GR Yaris and the newer GR Corolla have redefined what a "hot hatch" can be. However, for the hardcore tuner, mechanic, or restorer, there is a shadowy, often-misunderstood term floating around forums and Facebook groups:

Many owners of older models (like the NCP93 or XP130 series) seek out archived GSIC files or Service Information Guides