My sti runs like crap at over 30 degrees outside temp.. I defenitely notice loss of power and have been worried a few times about problems,, but then when airs 25 and under it boosts earlier and pulls harder and I grin and laugh at myself for thinking there's problems. I put it down to air density and maybe the intercooler being less efficient as well.. I'm no mechanic bit is my experience on this

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06 sti