PowerPipe Exhaust for slant/6

Hey Don, still lurking around and keeping my eye on the progress. I should have asked but forgot. The flange, how thick is this going to be. I see you have this all mounted up with a steel intake. I have an aliminum intake and its about 1/16 to 1/8th of an inch thicker. Hence why I have not mounted my super long tube comps due to the difference in thickness. Let me know when you have the time. Thanks.
Chas.