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OEM plugs are just fine. Fancy high priced spark plugs won't give you anymore performance gain IMO. Your stock plugs are probably fine with just 20,000 miles on them, look at how often you change the auto spark plugs.
 

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One thing to remember when using aftermarket plugs on newer HD's is that they need to be 6 ohm resister plugs like the HD ones.

Why? The anti knock provision to protect the motor is based on the resistance in the combustion chamber and needs a resistor plug to make it work correctly.
 
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