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Re: Upgrading from NGK BPR9ES from BPR6ES.
I would check the gap of your current plugs first... it should be somewhere in the .026"-.030" range. I worked on a gst one time that someone had put the NA plugs in there gapped at .046" It ran fine till it started making boost, then it would buck and miss bad.
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-When in doubt, Moar RPM.
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