IMHE, I've had more customers coming in who had recently switched out to resistor plugs only to find their fresh cap/rotor/wires in a sad state.. Namely lots of arcing in the cap/rotor and wires that are no longer w/ in spec.
The WIS states on many occasions that 5Kohms is the maximum total ignition resistance, beyond that they state that damage to the ignition componentry will result.
Were it really a non issue and simply a cost matter I do not think the service literature would state the above...
Just my 2.
Jonathan
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