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Ruthenium plugs part numbers

Leo Opalewski
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Leo Opalewski Enthusiast

Leo Opalewski

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NGK 97100 TR4BHX PSPE / NGK 94567 TR5AHX DFE design works for all LS based engines. Both spark plug specs are the same except electrode design. NGK says either will work for N/A engines while PSPE for boosted only. Currently using 97100 in 6.0l. No issues.

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