I live in Toronto.

I have already made schematics for what modifications it would take to fit a front mount intercooler (with a larger capacity than the stock) into the car. These are some of the things I learned.

You should be able to find many universal intercoolers that will work fine with the 850. You do know that you will probably have to remove your AC, make a custom mount for the radiator, literally cut off some support material for the hood, and cut away some of the bumper don't you? And when I say bumper, I don't just mean the plastic cover, I mean the actual steel bumper with a torch cutter. I have seen one or two guys get away with not removing some of this stuff, but those that did, actually put in smaller intercoolers than stock, or ran the intercooler so low to the ground, they had to modify their front spoilers like my plan did, locating the intercooler VERY close to the ground (read thread regarding skid plate to understand just how ridiculous this is). Just take a look at how close the stock intercooler is to the support for the hood. You've barely got inches, and the stock intercooler is pretty flat. Flatter then any aftermarket intercooler I've ever seen. Now you know why it's so flat.

When you open your hood and look at where the stock location of the horns are, you will notice that there is a piece that runs vertically right through the centre of the opening. It appears to be plastic, but is metal behind the plastic. This is part of the support for the hood. So you may have to find other ways to secure the hood adequately. Yes you still have the two latches at either side, but you now have no support in the middle of the hood, just at either side.

Then there's the reduced structurally integrity.

I'm not going to lecture anymore about how this really isn't a good idea for a street going car, so I'll give you the info you are probably interested in.

I've seen spearco intercoolers in the 850. This required some removal of steel bumper, and LOTS of removal of plastic bumper cover.

If you are in the Toronto and surrounding area, there are a number of shops that could probably do this for about $2000 Canadian. I worked on a set-up for a custom intercooler with a guy named Marco at his shop called Magnus Motorsports. It came out to about $1500 Canadian. Put it this way, this custom intercooler is even bigger then Spearco's and GReddy's!!! It's mounted so low, that I would actually have one of their guys rebuild my R front spoiler to make the central duct larger. I would also cut away the plastic cover until the gray upper part of the bumper.

So there you go. Spearco, GReddy are easily available through the mail direct. And there are shops that will make custom intercoolers if you have the dough. And that means about $2000 Canadian. If you are interested, I'll give Marco a ring and see what kind of developments have been made in the last year regarding intercoolers and what kind of downtime and money you are looking at.