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From my limited testing, it seems the OEM radiator does a stout job. The only reason I upgraded was because I was pulling the bumper and I knew over time with tracking the plastic end tanks would go. Oh and I got a steal on the radiator. I don't think it's a priority.
I ran the Perrin cold-air and it helped a little on IAT1s but never got data on IAT2s. The perrin extension makes the intake induction really long but it felt great on mine. I was considering modifying my AEM box, I think it can be done easily and it keeps the air sealed.
The BRZ runs like an arctic train compared to my CTS-V. My V feels like Africa after idling for 10 seconds from a cold start.
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