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How frequently do you need to change the spark plugs if running test pipes? I was gonna wait till the OEM service interval of 30k.
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Current Bimmer: '16 F80 M3, '20 F87 M2c
Gone but never forgotten: '13 FO e92 M3, Swifts, volks/advan, Akra Evo, Kics R40
Past: Alpine white e46 323i, Jet Black e39 530, Saph Black e60 530, Space Grey N54 e92 335, Mineral White N55 e92 335
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