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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > 440i Spark Plug replacment
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      10-05-2018, 12:16 AM   #23
j1980mac
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Are these 97506 still a great option for a fully tuned B58?
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      10-09-2018, 06:24 PM   #24
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Anybody can chime in if these are still used for tuned 440ís?
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      10-09-2018, 07:46 PM   #25
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I need new plugs too. I'm thinking of ordering these from Burger.
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      10-09-2018, 08:27 PM   #26
j1980mac
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Supposedly if you look up the May 2018 G01 production (my M40i), the OE plug is a Champion. I'm baffled.

Also, there's no OE spec for gapping. It's because they are "pre-gapped" correctly.
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