ebay! okay just make sure you have these questions answered:
-you need to make sure your header will fit to the turbo...
-the rest of the exhaust portion...might be some custom fab (nothing to bad)
-piping to go from turbo to intake
-and a nice pretty little filter for the turbo
-bypass and bov (bov is optional, but recomended against compressor surge). you don't want to vent the bypass to atmosphere, just stupid. you want to route it back to the exhaust somewhere around 3 feet past turbo exhaust exit (i can't remember why...i just remember).
just make sure you got plans that include atleast all that