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Re: Im a trader...
The pistons just suck on the EJ25. I don't know why Subaru never fixed the problem, but they did some many other things wrong with that engine also that it didn't matter. They had to add an exception to the Rally America rules for the STI in the Stock Production class to allow them to use aftermarket pistons because even though they run race gas and make less than stock HP(due to the turbo restrictor), they still broke pistons. The FA 20 motor seems a bit better and now the turbo is in a much close location to the heads to cut down on the lag caused by the 5 feet of piping to the turbo.
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