1x NGK R2558A-9 Racing Competition Spark Plug (with resistor)
0.55dia Electrode: Center Iridium / External Platinum
(angled ground strap ignition unit shape)
Heat Range 9
Long Reach type plug 12mm x 26.5mm, 14mm socket
*GT-R requires 6 spark plugs.
JDM Spec NGK 22401-RS080-09
NGK spark plugs are used in many different racing formats, including N1 racing. This is a highly reliable spark plug that features better ignition performance and reduced electric discharge voltages. A redesign of the ignition section tip has provided improved anti-smoldering or fouling characteristics.
for more details, please see our (blog post)