I have just fitted my new E3 connector to a '98 FXSTC. I have a new bike and the engine is far from in stock and I know that very well. I noticed that throttle response was quicker and clearer. Rolling on a 70 to 90 run is also faster. Can't say it affects mileage in any way, but I'm not worried about it. I will never go back to any other outlet. I'm so happy with it that I'm upgrading all my cars to E3 spark plugs.
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