I saw a W123 riding around here last week. It was painted in Jungle Camo and had a straight pipe coming off the turbo and out a hole in the hood.
I wish I would have had a camera with me....
Cool looking rig in its own way. I would never want to own it or drive it. Still interesting to look at.
They do get loud. Mine still has the muffler underneath. But, I cut out the resonator at the rear and just ran a piece of pipe with a turn down on it. It is fine until about 65 MPH. Then it starts to drone. I am having an new resonator put on in a couple weeks.