What DIA is the downpipe?
Its not something you just slap into “bender”. A mandrel bender takes an XX" dia pipe and slides it over a die which is drawn through the machine to bend it without kinking or compressing it. so once its bent up in a shape, there is no going back.
What exactly needs to be change on the DP? pic? If its a 3" stainless piece, there are some msc bends left over we could cut in to your DP and make it work. or pie cut it to change the bends or what ever.