For an additional $2,600 British STI buyers can add substantial power to their bottom line. The option delivers 335 horsepower, a jump of 40 ponies over stock STI spec. The 340R benefits from ECU tuning and a sport exhaust system. Another cool thing is the upgrade can be made retroactively with no impact on warranty. “The 340R power upgrade turns our most performance-oriented model into one of the most rapid and charismatic cars available in the UK,” said Darren James, Managing Director of Subaru UK. Hey Subaru, why can’t we get this program in the American market?