I can't find the tool either: Get a message, the item has been discontinued. On my 280SL, I separated the exhaust pipes by wiggling. It took a lot of patience. Those pipes are 1 5/8 x 1/16 wall stainless and there was no good way to clamp one side, like, to a workbench. I used a slug of lead to pound carefully on a clamp I had set-up. I put them together with high temperature grease and it paid off: The next time, they came apart easily. How about bringing the entire assembly to a muffler shop? If you end up cutting the pipes, note, that it is a real ***** to weld them together in the correct rotational alignment. You almost have to at least tack them on the car. If you cut at an angle, it is easier to weld them together properly. To make sure, just tack and try on the car. Then remove & finish weld.
Eastwood has it P/N 43583
http://www.eastwoodco.com/jump.jsp?itemID=11326&itemType=PRODUCT