How big is to big?
 

Ok so zip up ur pants im talking about intercoolers?

Ok so the intercooler i am looking at is 32"X12"X3"

http://cgi.ebay.com/ebaymotors/XXX-L...T-INTERCOOLER-
IMPREZA-WRX-STI-RX-7_W0QQcmdZViewItemQQcategoryZ33742QQitem
Z8054121401QQrdZ1

theres an example on ebay, so it looks like if i move or remove the water overflow tank for the radiator then i can fit this bad boy in there? but im not sure? also it looks like id be in for making some custome mounts?
think it will work? whats the bigest intercooler u ever fit in your mk3, if that one wont fit whats the bigest and where can i get one thats not 1500$ from greddy or hks or some such?

What kind of turbo are you running. Too big of an intercooler can hurt the performance.