Ran across an interesting item for custom header builders. Its available as steel or stainless steel, doughnut that is a very tight radius, the one picture is 2.25" dia tubing and is only 6.75" across that is a 2.25" radius centerline bend. They come in I think all sizes from 1.5" up to 3" in 1/8" incriments. For metric people 2.25" is basicly 57mm. Got it at a hotrod shop and I believe they are manufactured in Australia.