I'm sure you could run the CIS from the M103, but you're looking at a set of ignition curves and fuel requirments from an engine that makes less power with a lower power band and (most importantly) a much lower BEP and CR. CIS is only so tunable and I feel that especially if you increased displacement along with adding cams/head flow/valves/CR, the gain really wouldn't be that great. You'd be able probably get more gains for less on an M103 at that rate.

Just my 0.02.

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1993 190E 2.6 Sportline