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John, the efficiency of the stock intercooler is what this all about regardless of anything else. The stock intercooler has an efficiency of about 50% and the upgraded ICs are at about 90%. That means they will cool much more effectively regardless of the temperature.
Second, the pressure drop across the stock IC is about 2 psi and around 0.5 psi on the upgraded ICs. This means, you turbos have to spin at lower RPMS to produce the same boost with the upgraded ICs.
The bottom line is the stock intercooler is a hunk of metal that absolutely needs to be replaced.
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