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The NGK 6917 Copper plug (whatever that is) is NOT the standard that you should be using for an FD, first off... The FD came stock with BUR7EQ(P) and BUR9EQ(P) plugs in the leading and trailing positions. They are Iridium plugs with the option of Platinum (I added the (P) to show where the Plat denomination would be). The correct plugs may be a couple bucks more per each than the copper plugs, but they are worth the cost.
Many people opt to run 9 heat range plugs in all four spots, and do so successfully. I would suggest removing those incorrect plugs and going with a set of either the proper BUR7EQP and BUR9EQP plugs, or just BUR9EQP plugs all across the board.
You won't need to worry about upgrading from those plugs until you're running north of 400whp.
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'94 Touring - Cursed
'96 NA Miata
'14 Mazda3 Hatch
'14 Aprilia RSV4 R
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