As usual I'm late to the party but I'll mention using truck clamps since they weren't mentioned earlier.
Truck clamps are 3 inch wide stainless bands that come in most exhaust tubing sizes to clamp and seal two pieces of tubing to each other. I've using them since the mid 90's in place of flanges and collector gaskets.
https://www.napaonline.com/en/p/EXH33226
Photo shows one on my Burban. The Vice Grips are holding the clamp tight as I fabricate the rest of the exhaust pipe. I had to modify the exhaust when I when I moved the crossmember to go from a T400 to a T350. They seal well and are helpful when building your own exhaust from U-bends.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread
http://67-72chevytrucks.com/vboard/s...d.php?t=698377