I have built quite a few sets of headers and taught a handfull of guys in shop how to them. The absolute hardest part of building headers is the visual lay out of how the tubes will run. I'm a big fan of having as much of what goes under the hood in place, starter, upper control arms, etc. Then layout want tube will go in what position and how they will fit in the collector. The tack it all togther and try to get the best fit possible, it makes the welds look great. After you have 4 tubes cut them off one at a time from the flange and weld them solid. Replacing themback on the flange to the others to keep the collector location. Then once all 4 welded tubes are back in place, make the center transition for the middle of the four tubes and slide on the collector. If you buy the bad ass collector like John showed it comes with the middle in it, but they are pricey. But worth every penny.
If you get you part numbers togther I'm a dealer for SPD and I can save you alittle dough and drop ship them.
Good luck, Building headers are fun.
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