Fitting the aftercooler behind the intercooler wouldn't make sense in my case. The supercharger belt is in the way. And the coolant needs to go from bottom of the engine to the top and go down again.

It would be good to check the coolant system again. Got everything flushed 4 years ago. Didn't had any problems tho. No crap came out of it then. Radiator is 2 years old and so is the stat.
Problems kind of started when the original radiator was replaced with the cossie one. But for the 180hp that wasn't a real problem.

Im going to check to be sure tho. Still the problems begin at low speeds and at high speeds it will happen but it takes longer for the temp to creep up. It will cooldown again but the system just can't take the heat at low speeds

Increasing the pressure isn't the best remedy but still better thanlosing coolant.
So if anybody knows where to get a diffrent cap. I would still like to hear it