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Interesting. Looking at your temps, there is a significant increase in temp when the car at idle. This definitely is attributing to your low numbers just off idle. Looks like the stock airbox does well in insulating the engine heat. It's kinda weird that the Evo shows a lower temp at 55mph than stock though. You would expect that since the stock airbox insulates better at standstill, it should be lower in temp at 55mph also...unless it is still storing heat. But you've also tested running to 55mph from start (cold I assume?) so that kinda rules it out. Regardless, it looks like both are running around the same temps at 55mph...94-96 degrees.
Before going to GIAC, you should get your a/f measured. And not with the sensor that goes in the tailpipe as that is not very accurate. You'll have to drill into your headers pre-cat and attach the sensor there. Afterall, if your a/f looks fine, then the issue is with the intake. If your a/f is out of whack, then at least you know you need the GIAC.
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