I am running a Saab 900s intercooler. It fits in a mk2 very well, at least with no a/c coil... It's kind of small though, and the air doesn't go straight through but has to make a turn to get out.

I mounted it upside down from how it goes in a Saab.
StarQuests were all over the junkyards here a few years ago. I still occasionally see them but they're one of those cars that really disappeared from the roads, compared to say the 300zx which you can still find. I want to find the hole they pushed all of them into...