I'm pretty sure there is a piggyback chip out there for the 2.5RS/Legacy. It'll give you 10hp and load less reliability IIRC.
Honestly, though, I'd rather do Cobb intake, headers, exhaust then the piggyback chip.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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