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Your car might be doing what mine is, and has done since I've owned it. It generally runs great, but if I run it really hard for a while without stopping to let it cool (consecutive drift runs), the exhaust note changes slightly (sounds more smooth and loses the ka "roughness" in the tone) and the car becomes extremely gutless, to the point where even first gear requires full throttle. I think it's a timing issue, I don't know if it's detecting knock or something and retarding timing, but I've never been able to figure out what's wrong. Usually won't run properly again until it's completely cooled down.
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