Well you can get an INTERCOOLER for like 300 or less on ebay, but then having the pipes fabricated can be a pain to get a good job at a cheap price. I'd say give yourself anywhere from 600-800 bux for a custom set up, remember you need a BOV, tigwelds, everything, i'm sure you dont wanna run with steel, probably aluminum? Figure 300 bux for intercooler core, custom piping plus flange for BOV, plus hump hoses, and clamps for about 400 i'd say. Well i guess it all depends on the shops around ya, call around man.