[Jack21]

Not sure this helps or not as I'm not sure how Midstates attaches the sidepipe to the header.

While going through the Classic Roadsters sidepipe muffler swapout, I cut the muffler off in front and rear. Had the turnouts welded to the new mufflers, and a slip fit (3" ID) welded to the front of the muffler.

Now, I have a 4 into 1 "J" pipe. It attaches to the header with 4 bolts, and a 4 hole gasket in between. Slip the 3" ID muffler adapter over the 3" OD "J" pipe. Bolt the turnout up to the car.

Then I ran 3 self tapping sheet metal screws through the muffler & J pipe to hold it in alignment. Took assembled muffler & J pipe back off and into the welding shop for final assembly.

While you have the J pipe apart, now is a good time to have the inside ceramic coated for heat retention and rust protection.

Hope this helps.