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There is no real difference that I know of other then the one being platinum & the other not. The standard plugs will be fine, but if you want to spend the extra money on the platinum then go ahead. Nothing to be confused about, there are other plug combos out there with various heat ranges & adjustable gaps. The BUR9's/BUR7's are the suggested plug.
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Boosted Big Body On 335's
PS3 ID: Rotordad
1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect.
2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.
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