Your 103 motor uses KE 3.1 and has a airflow door very similar to the 944 except it controls a hydraulic system rather than an electronic control.
The system should do well measuring the extra air you will pump. If you need more enrichment a auxiliary control of the EHA should be able to give all that is necessary.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician