Oh wow, what size piping is that? That is a very small intercooler, I have to wonder what the PSI drop is in your setup. Does that muffler flex stuff actually hold air?
I did this with 3" piping for under $300 including the modifying of the intake.
http://www.superturbodiesel.com/std/showthread.php?tid=1235&pid=53336#pid53336