HKS M-Series Super Fire Racing Spark Plugs RE Type Heat Range 10 Mazda RX-7 79-91 / Mazda RX-7 FD3S 93-02 / Mazda RX-8 04-09

The Iridium alloy is used because of its durability and reliability. On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity. With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration. The Iridium plugs are available for multiple applications and offered in ?colder? heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered. M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load. All spark plugs are sold individually.

Features:

0.6mm Iridium Alloy Center Electrode
Outer Electrode with Platinum Chip
Short Type Outer Electrode (Anti-Vibration)
Thermal Edge
Prevent Carbon Build Up
Heat Range: 10.5
RE Type
Thread Size: 14mm x 12.7mm
Wrench Size: 20.8mm

Fitment:

Mazda Rx-7 1979-1991

Mazda Rx-7 FD3S 1993-2002

Mazda Rx-8 2004-2009

Notes:

Pictures for marketing purposes only, actual product may vary

Other Part Numbers:

HKS #hks50003-M525RE