The bell flare is something that was only made by the factory (they made the dies). Although you might be able to buy some properly bell flared pipes from an aftermarket "on line" company like Summit (but I'm not sure and they won't be cheap). I have 2 sections of properly "bell" flared down pipe left over from I used to make them. No muffler shop has the correct dies so I would get a regular piece of 2 1/4" pipe and get a large straight flare made at the muffler shop then bring them home and use a 360 magnum manifold (large hole) to hammer (peen) a bell into the flat flare so that the flare would match the bell of the manifold. I'm a machinist so I'm pretty good at that kind of stuff. I would sell the flared pipe with the flange adapter for $30 plus shipping. At the moment I don't have any flange adapters but I could get more. I will sell the 2 remaining sections of magnum bell flared pipe for $21 each plus shipping.
The only reason I started making the bell and 340 (see pic) flat flared pipe is that they are hard to find for a decent price, if you can find them at all. The correct flange adapters are also hard to find for a decent price.
I've stopped selling 340 and 360 magnum manifolds so I also stopped making the flared pipe. I have a few pieces of bell flared pipe (as seen in pic) left over. I also have some "super tight" mandrel bent 2 1/2" pipe that I used to use to make the driver's side 340 down pipe as seen below:
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I made this stuff because you can't buy it anywhere....................
Treblig