Without going into the long drawn out explaination that has been hit on multiple times in this forum, do a search, you need to use MB type plug wires and non resistor plugsw to get the best running most efficiently running engine. Long explaination but seems to be true. I tried it both ways and have since gone back to the proper wires and plugs, even though they are hard to find.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red