Intercoolers

Has anyone added a intercooler after installing a t28 turbo? How much are intercoolers for Audis. I have seen good T28 turbo kits for the A4 but have not seen one that includes a intercooler. What are some good brands that make them for the A4 so you dont have to fab or remove anything?

i know that you can make one for like 450 just buy a core form somthign liek ebay and then lok for the hoses for it. it comes out freat and is alot cheaper.