Simply not true

 

Any plug meeting the specs of the HD plug in heat range and resistance will work fine. It only needs to be a resistor plug with 6 ohms resistance.

I use the NKG iridium plug from J&P. They preserve the anti Knock system and work better than the stock HD plug in all aspects.

 

Can you elaborate? I'm having difficulty believing that any difference - at least from a performance perspective - could be phsycally noticeable. Psychological for sure.

Its hard enought to feel the ~~ 10% difference you get from a Stage 1, let alone a very slight marginal difference with plugs (even wonder if the difference would be measurable)

 

Argue with these guys https://www.hdforums.com/forum/fuel-...ml#post9372265 I trust their knowledge, more than someone from the internet.

 

No need to, I have experienced what works. Funny you refer to some guy on the internet as not knowing but refer to a thread on the internet as the truth, LOL Where did you become acquainted with FM? On the internet is my guess

 

No....... I'm a customer. I was refereed to them by a friend. I've been to their place of business. I've met them in person. They are a half days ride from where I live.

Nice try though..... thanks for playing.

 

You crack me up, LOL

 

Sounds like you have faith in their knowledge.

 

They are the go to guys for tuners, maps, intake and exhaust. They are also a forum sponsor. http://www.fuelmotousa.com/

 

Maybe they've learned something since the 3 years that they posted the incorrect information about the spark plugs.