Best Intercooler for Volkswagen Golf

You mentioned heat soak is an issue where you live so there's your answer! IC was already my vote before I even read that part of your post.

I don't understand how the upgraded intercooler is making the car actually faster? I understand keeping temps more stable or even cooler with more boost helping to preventing heat soak, Resulting in more consistent power but how is the motor actually making more power in already cool (ideal) conditions?