Im not exactly sure on this but from what i hear, the EYA is a resistor type plug, dont ask me what that means, but i do know that the EYA is much less foul-prone than the ES. Hope this helps...
Br9eya vs br9es
What is the difference between these two plugs besides the groove in the electrode? The 9 tells me that the heat range is the same...why do I need to spend extra to replace the 'S' with a 'YA'??
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