One other thing I was going to ask about. I am planning on building my own headers. For my 46 and 52's I plan to use 3/4" OD aluminum tubing and for the 36's I plan to use 5/8" OD aluminum tubing. I don't know just what thickness of tubing I should go with. I have read in one place that Macs uses .035 wall thickness and OS uses .065 thickness. I can compromise and get .058 thickness if anybody thinks that will work. Should I go thick , thin or in the middle?