I just got my custom one ~1 month ago. I'm very happy with it so far.
Gerhard was very helpful and the craftmanship is excellent.
With the weather being very cool up North here, I can't really say how effective it is when its 100F out. But in my last few outting on track with ambiant ~60F or below, the intercooler rocks. And when driving on street, when you stop the car, one side is warm & the other is stone cold.
So far, I am very satisfied.
87 930 K27HFS/B&B/Twin-Plug... Megasquirted