HKS MR-Series Super Fire Racing spark plugs are high-performance Iridium plugs designed to handle advanced levels of tuning and provide Improved ignition performance, durability, and anti-carbon build-up.

– HKS is offering NGK heat range 9 equivalent spark plug, which provides a higher grade of peace of mind with a tuned car.
– Durability is ensured by alloying the central electrode with ruthenium.
– The center electrode diameter set at 0.6mm reduces the required voltage and improves ignition performance. (Stock: 0.8mm)
– Ground electrode with platinum alloy tip improves durability and ignitability. Shortened ground electrode length contributes to electrode strength and durability.
– The ground electrode contains a copper core to suppress the temperature rise of the electrode and improve durability.

Warning
Using these spark plugs on a vehicle incompatible with this type of spark plug may lead to serious engine damage. When replacing sparkplugs, be sure to compare the shape of a new plug with the installed one. Please select an appropriate spark plug for your vehicle.
HKS provides a complete database for other model vehicles also suitable not listed above please confirm which plug you need before purchasing by clicking below.

Plug Series Search

Please note that JustJap is not responsible if plugs are purchased incorrectly using the HKS part finder, returns/exchanges will not be accepted if wrong plugs are purchased.

Engine Compatibility:

– BMW B58 B48 Series Engines
– Toyota A90 Supra 3.0/2.0 B Series Engines