heavyhemi55
Junior Member
I am trying to find the best spark plugs and coils for my 2018 6.4 hemi! There r a lot out there and witch is the correct ones for performance!
6.4 hemi Coils and plugs
- Thread starter heavyhemi55
- Start date
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Bigskyroadglide
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ImHO, the stock coils and Factory defined plugs for your engine are the best option.
I would only use a different plug if my tuner recommended and was tuning for that plug, (ie a colder or hotter range)
I would only use a different plug if my tuner recommended and was tuning for that plug, (ie a colder or hotter range)
Jim BB
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so are you you saying factory (OEM) plugs from dealer?
Daw14
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You can purchase the factory plugs from other than the dealer and save lots of $$. No need to change a coil except if it is defective,and then the OEM is a very good product and you won’t find gains with others.
Wild one
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Just don't buy plugs off Amazon or Ebay.NGK's are one of the worst plugs to be fake from either site.
You won't find any hi-po shops using after market coils on any build making north of a 1,000 hp,they all are using stock coils..
You can rebuild your stock coils with new rubber boots and springs,and use a dremel with a carbon steel brush to clean up the contacts under the springs. If your rubber boots and springs are in good shape,you can just pull the springs out and give them a quick wire wheel cleaning on a bench grinder,i also stretch the springs out about a 1/4" if i'm re-using the stock boots and springs after cleaning the springs.
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0hubcap0
Junior Member
Just changed mine out today. I went with the NGK Iridium IX 4469. Found them at Walmart they had the best price, $39.98 for a 8pack….Just bought the 2018 tradesman Power Wagon with 83k, so I’m going through everything. Changed the oil, coolant and plugs. Next will be the diff fluids and T-case and trans. 
