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What Heat Grade Plugs For 15psi Tubby

midmotorsteve

By midmotorsteve,
in MR2 Club

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midmotorsteve Mentor

midmotorsteve

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so i read that on upping boost i should go a grade colder spark plughs and re gap them to a slightly smaller gap?

What heat range should i buy then? anyone any gapping suggestions running on uk super unleaded?

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