Jeep kept the same CJ-2A thru CJ5 front exhaust Pipe, long Exhaust Pipe and Muffler for the first CJ-5's.
The 4 Cyl 55-71 CJ-5 came with two options, a one piece exhaust pipe between the head pipe and the muffler (same pipe as on late CJ-2A thru CJ-5 or a two piece that was made for CJ-5 4 Cyl that had a Winch PTO. These all had slip joints with clamps, the M-38/M-38A1 had bolted and gasketed flanges.
The CJ Pipe had a 90 Degree bend at the muffler as the mufflers were perpendicular to the frame rails. The M-38/M-38A1 mufflers mounted diagonally at the rear. Not sure if the every day muffler shops with benders could replicate the short tricky bend at the rear of the M-38/M-38A1 extension ( long pipe). Some of the GI Issue pipes had a plating.
Two totally different set ups. SS would be neat tho for a show Jeep.