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1998 Pontiac Firebird - Spark Plugs

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Denso Iridium TT Spark Plug - 4713

Part #:: 4713
Line:: DEN

1 Year Limited Warranty

Metallurgy: Iridium/Platinum

Center Electrode Tip Material: Iridium

Heat Range: 16

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Denso Iridium Power Spark Plug - 5325

Part #:: 5325
Line:: DEN

1 Year Limited Warranty

Metallurgy: Iridium

Center Electrode Tip Material: Iridium

Heat Range: 16

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Denso Double Platinum Spark Plug - 5070

Part #:: 5070
Line:: DEN

1 Year Limited Warranty

Metallurgy: Double Platinum

Center Electrode Tip Material: Platinum

Ground Electrode Tip Material: Platinum

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Denso Copper Plug Number T16EPR-U15 Spark Plug - 5023

Part #:: 5023
Line:: DEN

1 Year Limited Warranty

Metallurgy: Copper

Service Number: T16EPR-U15

Center Electrode Tip Material: Nickel