Subaru joins fellow Japanese automaker Suzuki Motor Corp, which announced its exit a day earlier.
Their exit leaves just world champions Citroen, owned by PSA Peugeot Citroen, and cash-strapped Ford Motor Co chasing the manufacturers' title next year.
Honda Motor Co, Japan's No.2 automaker, this month quit Formula One racing for similar reasons, saying it needed the cash for its core auto-making business.
Rallying does not have anything like the budgets of Formula One, where a team like Honda can burn through $500 million a year, and the sport also has a long-standing tradition of private entrants.
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