Spark Plugs

Copper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance, and longevity of the spark plugPatented SAC-9 semi-conductor resistor for maximum EMI and RFI suppressionPatented Ultraseal...

*American-made spark plug*High-conductivity copper nucleus and wide base insulator with special thermal bonding*522 nickel alloy electrode*Control heat, fight fouling and provide quick starts*Sold Individually As always, 21 Motorsports offers FAST and...

Copper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance, and longevity of the spark plugPatented SAC-9 semi-conductor resistor for maximum EMI and RFI suppressionPatented Ultraseal...

Copper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance, and longevity of the spark plugPatented SAC-9 semi-conductor resistor for maximum EMI and RFI suppressionPatented Ultraseal...

Features0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potentialU-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenchingDENSO patented 360 degree laser welding process:...

Features0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potentialU-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenchingDENSO patented 360 degree laser welding process:...

Features0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potentialU-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenchingDENSO patented 360 degree laser welding process:...

FeaturesDenso # 4045Denso Traditional Nickel Spark PlugU-Groove Ground ElectrodeDenso # 4045 Denso Traditional Nickel Spark Plug U-Groove Ground ElectrodeDenso's standard plugs have always offered a patented U-groove ground electrode producing for a...

Reach: 3/4 InchResistor: YesElectrode Type: Fine WireElectrode Core Material: IridiumElectrode Tip Material: IridiumInsulator Type: ProjectedThread Size: 10 MillimeterSeat Type: GasketWrench Diameter: 5/8 Inch HexLaser Welded Iridium Center Electrode...

Reach: 3/4 InchResistor: YesElectrode Type: Taper CutElectrode Core Material: IridiumElectrode Tip Material: NickelInsulator Type: ProjectedThread Size: 12 MillimeterSeat Type: FlatWrench Diameter: 11/16 Inch HexFine Iridium Tip Ensures High Durability...

Reach: 3/4 InchResistor: YesElectrode Type: Taper CutElectrode Core Material: IridiumElectrode Tip Material: NickelInsulator Type: ProjectedThread Size: 12 MillimeterSeat Type: FlatWrench Diameter: 5/8 Inch HexFine Iridium Tip Ensures High Durability And...

All-new plug design features a unique electrode shape that maximizes the power created by the spark plug - Diamond Fire technology Electrode is a combination of performance and new technology that results in an improved flame kernel shape This flame...