[RichardJ]

I've always used 2-bolt flanges for a crossover. Even though I don't need to remove the exhaust in order to get to the trans on my inline six, I wanted to be able to handle one side at a time if I ever had to remove it. The long tube header collectors are staggered about 6", so i staggered the crossover, the same distance. The curved tubes on the crossover worked perfectly for the stagger.
The V-bands are nice and modern, but the 2-bolt flanges have always worked well and not leaked for me on a crossover.