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The plugs you have listed BUR9EQ/BUR7EQ are copper plugs & the BUR9EQP/BUR7EQP are platinum plugs. The platinum plugs will be more expensive & said to last longer.
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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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