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Sportsguy83, I want to say the 30's have a nice meaty boss that can be drilled. Lots of others don't. I should have added a bung when I welded on the the elbow to my housing, now I have one shot to weld one in. I could just tap the elbow but I just don't know if its enough meat to hold the fitting. It would really suck to loose that line under boost, I'm already going with braided stainless reference lines.