Arospeed makes those things:
http://www.arospeed.com/product_info...products_id=92
It comes with a plastic cover for everyday driving and then you take it off at the track to get more air in there, so it'd be ok to use in the rain with the cover on. I saw it on some show on Spike TV a few months ago. But on the stie you can se a pic with it on a Civic, and it doesn't look like an intercooler, looks more like an oil cooler.