I just had a boost deficiency problem with my SDL. The fitting was restricted but the actual blockage was where the braided hose transitioned to a short piece of hard plastic pipe which then transitioned to a rubber fitting w/screw clamp which then attached to the firewall mounted boost sensor. The very small diameter (1 mm) plastic pipe was plugged by carbon almost 8 mm in length. Cleaned out every thing and plenty of boost with the ALDA working. Looking at the problem I think that a baffle or screen on the boost fitting intake would be more useful? A larger surface area for the orifice would be harder to clog and would reduce the amount of carbon traveling through any hose?

Would simply opening up the boost fitting (drilling out) allow carbon to enter the hoses, sensor and ALDA easier?

It goes without saying that disconnecting the EGR should greatly reduce the introduction of carbon in the first place. My next project is to do this and then clean out the crossover pipe and intake manifold.