One other thing to note, more would know this over in tech help:
The additional vacuum line(otherwise the Gasser 722.3xx is identical To the diesel 722.3xx variants aside from stall speed and ratio variations) which comes from the Bowden cable housing, it is an interruption in the cable signal for the cat converter to heat up quicker, it makes the car hang up in second gear for ~45 seconds when it is cold, then the vacuum is switched off and normal shifting functions resume.
Just an emissions device like the air pumps
I’ll likely cap it off to keep junk out but I have it vented to atmosphere atm

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate