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Discussion Starter #1
Ive been trying to find the right plug for my 07 EX 500, (and trying to determine if I should get the D9EA or DR9EA). Did NGK change their part numbers? 2420 and 3437?

Also any input on the D VS DR, I know the DR has a resistor in it, should I avoid double resistors since one should be in the EX 500 Cap?
 

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Discussion Starter #2
BTW I did find some with the new PN (2420 and 34237 just wanted to ensure I am getting the correct ones).
 

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3437 is correct DR9EA .............4772 optional Iridium DR9EIX ............... both listed as correct, looked up right off their official website www.ngk.com
 

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i can't answer for what "some places" list but would certainly be inclined to trust official NGK factory recommended info.
 

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I know this is an old thread, but for anyone else curious the only difference between D9EA and DR9EA is the latter has a built in resistor to help prevent electronics from malfunctioning (think of audio systems).
 
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