The stock intakes are plastic for a reason, plastic is a good insulator and has low thermal conductivity. When installing the G3's I did get some performance improvement driving around on the street, but after 10 minutes on the track the tubing was reaching 230F and doing a lovely job of being a "hot air" intake instead of a cold one. I used some reflective wrap insulation on the intakes and it did help bring down the temperatures back down, although still not quite as low as stock.
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