2" to 2 1/8 step with a 3 1/2" collector. Also Hedman Hustlers. I have a new set of the Hedmans if you are interested in those. I will be using the Mazzolini/TTI pro parts headers instead.
Or you can buy the smaller flange from Indy and get a set of 2 1/4 or 2 3/8 tube headers made. I believe that is what MoparAl has in mind after he bought the flanges I had. He is also building a B1 572.