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Non resister and geared more for racing. Ryan likes them and he feels they work better with a higher boosted engine (besides less chance of spark blow-out since they are not extended tips).
Since I track my car, running a bigger pulley combo, run at higher RPM (due to road racing), he felt these would give me what I needed for tracking a higher boosted engine. These were tailored to my usage/engine setup. I’ve had 0 issues, no knock/detonation and I do drive on the street a lot.
There are other reasons, but those were why we went with those for my application.
FYI, no noise interference with the non resistor plugs...
-Don
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