Hey there. Picked up a 2002 STi in August of last year. I'm not sure what all mods are installed, I know it has DEFI gauges, adjustable Tein suspension, not sure of the exhaust, and for some reason it seems to be pretty popular here, a pretty small MOMO steering wheel, ha ha.
I know this is primarily a US board, but I don't think I'd be able to read any Japanese STi forums. If any of you guys have knowledge of JP spec STi's feel free to weigh in.
I have an intermittent check engine light that comes on, no real rhyme or reason to it. If it's idling and it comes on, a blip of the throttle makes it go away. If I'm driving at a constant speed and it comes on, shifting or going to neutral makes it go away. Usually occurs at less than 2.5K rpm, or after a couple of high rev shifts. Pretty annoying.
Also, when in stop and go traffic, if I have to creep forward a few feet, after I clutch in to coast, the engine will feel like it's missing for about 5 seconds, then it smoothes out, sometimes with or without a check engine light.
Took it to the dealer for the CEL problem, and through various iPhone translation apps, they replaced a part (not even sure what it was, piece of metal/plastic with two small plastic pipes for small rubber hoses to slip on) and that worked for about 3 days, and the CEL came back. Then they said they had to move a wiring harness to some work done for a previous owner, so they replaced/moved it back for free, about 8 hours of labor. Japanese customer service is pretty sweet.
According to the gauges, max boost is 26.2 psi. Doesn't that seem a bit high?