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I replaced my stock original plugs with 23k miles on them with new NGK 94201s. Gen 1 B58. Gap at .022. BM3 stage 2+, DP, HPFP and the engine is WAAAAAAAAAAAY smoother.
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'17 440xi GC THP, MPPSK, AA Catted DP, Dinan CF CAI, TU HPFP, BM3, xHP, E-Sys
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