These spark plugs are designed standard to highly modified engines.
The center electrode on these plugs are iridium alloy, which provide stronger spark even at lower voltage, beneficial for creating power and response.
0.6mm high refraction iridium alloy center electrode.
Nickel gproject typeh ground electrode.
NA engines can expect an increase across the rpm range, and turbo engines can expect lower end torque.
SKU / Manufacturer Part Number: 13000067