John I sort of enjoy reading the tech detail u go into, even though i dont understand some of it....lol
anyway, i got a responce from the guy who has this setup
there was no trouble mounting the intercooler behind my front bumper. I do not use the standard bumper, it´s an english styling kit from Prima Racing. I took away the metal "crash-bar" and the plastic foam behind the bumper for more space...
You can also mount the EVO intercooler behind the standard front, but then You have to cut quite a lot in the bumper... You can see pictures of a Calibra with standard fronr and EVO6 intercooler at a friends site, totally 3 pages of Calibra pictures (in Swedish, so "nasta sida" in the bottom of his page means "next page"...): http://www.blyfot.nu
The prices in Sweden is approximately 550-600 Euro for an EVO6 intercooler, but you can always try to find one that is used.
I did not notice any more turbo-lag, I do even think that it boosts earlier now. Probably due to better air-flow and much more efficient cooler. The Calibra really needs a better intercooler...