It is possible that the later 124s have more computerized stuff. The '87 (including mine) has almost none of that; the EGR can be completely removed along with the vacuum junk behind the right headlight and the ARV capped off. I haven't noticed any performance differences but the IM should be a lot cleaner inside without all that soot.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970