If you meant similar to the M-103 EZL then yes, it is. (All 3 of my Benzes are W-124s.) I'm not worried about going too rich as I've done breathing improvements that need to be compensated for anyway and both of the LH ECUs I'm running are 93s and therefore lack WOT fuel enrichment. If it gets too rich I can always up the temp. back to 60c or 80c. I saw an over 3 tenths improvement in the quarter mile just from dropping the eng. temp. from approx. 90c to 80c. I also have a traction problem at 80c that I don't have at 90c. (This is a non-ASR car.) Regards, Eric