You may want to first check your “charge” line from the intake back to the ALDA as Rogviler has already suggested. The EGR can really clog up the intake and every orifice it has. If the line to the ALDA is clogged at any point then you’re not going to experience boost. Checking this line for an obstruction is the easiest and always MY first on the list when I suspect no boost. Hopefully the issue is as simple as this line being obstructed.