Doughnut shaped exhaust pipe, what for?

Right from the link:

If you need to fabricate an exhaust header or intake system with tight bends, our 360-degree Summit Racing™ full round donut tubing is an excellent way to start. Offered in steel and stainless steel, simply cut the donut into whatever angles you need and weld the tubing pieces into the desired shape. The exhaust tubing is available in a variety of gauges and diameters.
 
Isn't that what a tubing bender is for?
I ran into a situation about a year ago where one local bender couldn’t make a small, tight bend, so I had to go to a different shop that charged me much more. I would have liked to have experimented with this Summit piece. It possibly could have saved me some money.
 
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What I'm thinking about ...
 
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