Just been through something similar, a leak in the intercooler will show as a black mist (or worse) on the actual intercooler. This looks like a leak from the hose to pipe connection. Pretty easy to remove the intercooler and hoses to check.
If no holes clean it up also clean the hoses and refit, make sure to use continuous pressure house clamps.
If it’s stuffed get an aftermarket ting welded Intercooler and after market hoses, cheaper and better than the original.

Also if you do fit a catch can, make sure you get a genuine Provent 200 DON’T get a cheap copy.