Seems like it's an Andial/ Garretson according to this site?
Andial Garrerson Install Instructions
My 930 has a K27 7200 turbo, 0.9bar spring and B&B exhaust. I am also considering stacking original IC's. I know it is not as efficiant, but I assume it will do the job. Summer here is mostly 70F ish, so the IC (and air intake) will be fed with cool air. Car will see some track days.
Anybody measured engine intake air from a stacked IC?
According to this site,
intercooler, stock (single) intercooler is 151F @ 85F ambient, while Andial is 120F @ 85F ambient. Stock 88 930.