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There have been some problems with the strength of the pistons in high-powered EJ25's - including some stock STI's - that can be completley solved by getting forged pistons.
No catastrophic failure happens, but they will lose compression and thus make less power than they should. Often, the owner won't notice anythign until the enigne gets a compression test or rebuild.
They don't come stock because it's harder for Subaru to get cold-start emissions with forged pistons.
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The early 265hp WRXs (09 model year) had some problems with owners blowing the engine (main bearing failure) even before the break-in was over. This was a manufacturing defect and has been resolved.
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Otherwise... newer EJ's are "interference" engines - if you go way past the timing belt change interval and it fails, you need a new engine.
Mainly if you keep up with preventitive maintenance and have good synthetic oil, even a modified EJ should be running strong for a solid 200k.
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@Ichitaka - really? I burn very, very little oil - even having the turbo - I don't think I've ever had to add oil inbetween intervals. Granted my car is pretty new... but I've never heard anything about latent oil loss like you describe. Time for piston rings / maybe a small leak?
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