Oh no, you can't fix that. I'll take it off your hands for you
Just kidding....I'm sure if you find someone that can weld aluminum, they can fix it for you. Take it to a radiator shop and see what they can do. How did it crack? I've heard places have a hard time aquiring those things anymore. There's a place on the internet that sells aluminum rods too that you are supposed to be able to use a regular propane bottle to work with. Here's their link:
http://durafix.com/?go2
Best of luck!! Once you get it repaired, make sure you support it good. I've heard from other owners that the actual install kit for the big intercooler sucks. You may have to fab something up so it won't crack again next to the weld.
George Blake