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.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician