it usually installs under your map sensor, because the stock map is not ment to see boost your ecu puts your car into limp mode when there is boost pressent, the missing link is also know as a bipass valve,

question? does your check engine light come on after 4 or 5 secs of boosting? If so the missing link is your problem, check for one on ebay or at synapse here is there part number for your year and model #44717