The intercooler debate is probably more of a sore point. Some say a big upgrade is essential, some reckon the standard cooler is good for a k04 conversion with 2+ bits. I personally believe it's somewhere in between. I'm on the standard one and apart from on the odd hot day where I probably convince myself otherwise, it seems to be quite consistent. I don't do any track driving, and I don't sit in much traffic.
Maybe if you're on a 2+ map with the turbo maxed out you'll generate a bit more heat. But on Stage 2, and in my circumstances, I'm doing fine.
Just get a revision G dv or GFB DV+. Sorted.