I wouldn't be surprised to see a 40 whp swing between winter and summer here. On my previous turbo car, even a front mount IC, meth, a turbo blanket and a metric ton of Thermotec header wrap only partially cured it.
If you want to hide the intercooler, just grab a can of Eastwood radiator paint for $5. I'm not 100% convinced that the thermal dispersant coating makes a real-world difference. In a testing envirnment, sure, but there's just too many variables out in the real world to quantify.
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