Two more cylinders were added in 1987 in a quest for more power and in 1989 the company introduced a 2.0-litre double overhead camshaft engine with a turbo-charger, which paved the way for Subaru’s success on the World Rallying stage. Subaru’s next-generation Impreza will continue to use a boxer engine with plans for a diesel version in the pipeline to suit European demand.