I am adding Banks revolver headers and high flow cat and magnaflow cat back exhaust, all 2.5" except that stock crush bent front pipe.

Does anyone make a 2.5" mandrel bent front pipe from the header flange to the cat? I have searched and can't find much.

Is anyone interested in this?

Can have any worthy exhaust shop make you one.

Almost no exhaust shops have the ability to mandrel bend tubing. Those benders cost way too much for most shops. What they can do, if they are willing, is build the pipe out of pre-bent tubing sold by the hi performance exhaust manufacturers such as Flowmaster, or Dynomax. I did that many times when making headers for the local circle track guys before I retired.

I used a 2.25/2.5 off a grand Cherokee

I had an exhaust shop put new 2.5" from the header all the way out the back.

Is the Grand Cherokee pipe different? bigger?

It's still 2.25 from manifold to the middle of where it crosses under the transmission then it has an egg shape connector that converts it to 2.5 no kink though almost mandrel bent