The milestone engine powers something a good bit larger than the 1000, which was (ironically considering Subaru today) the brand's first front-drive vehicle. Today's boxer, the so-called FB25 2.5-liter four, was built for the current Legacy and Outback.
The 15 millionth Boxer hasn't been the brand's only accomplishment in 2015. The company built its 14 millionth Symmetrical all-wheel-drive system just last month. Subaru has only been at its trademark AWD system for 43 years, and with sales going the way they are, it seems only a matter of time before the Boxer engine is surpassed.