Subaru is embarking on engineering, design and technology overhauls to keep the small-scale, niche brand competitive in a global industry in which high volumes matter like never before. The first two changes will debut in the next-generation Impreza small car arriving in the second half of the year: a new modular platform Subaru says will improve safety and driving performance, and a new design language dubbed Dynamic X Solid to enliven the brand's image.