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S4R spark plugs
I'm gathering spares for a newly acquired S4R and am looking at plugs.
Ducati RA59GC seem to be factory fit but they are silly money. What is the correct NGK or Denso alternative? I've seen conflicting information out there so am hoping the forum hive mind will steer me right!
The bike has been decatted and has DP filter with open air box and is running a PCIII, if that would affect plug grade requirements?
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