Elite spark plugs for the serious racer, the DENSO Iridium Racing best demonstrates its performance improvement during acceleration. Experience more power and torque, as well as increased engine efficiency and fewer misfires when ignitability is difficult.

Built on DENSO's advanced iridium-rhodium technology and the company's decades of leadership in ignition research and development as well, DENSO Iridium Racing® plugs are components of championship caliber.

- Using the same basic 0.4mm center electrode configuration as DENSO's Iridium Power® plug 

– DENSO's motorsports plug is further enhanced with a 0.8mm ground electrode of 100 percent platinum

- Special insulator material with 20 percent greater strength than conventional plugs, and other valuable features for hard-core race applications.

- Surface-gap, recessed, and ultra-compact 8mm plugs are available for a wide range of specialized racing engines.

What does Heat Range mean?

"Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. This means the spark plug will heat up easily and reach its optimal operating temperature. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine." - NGK

These plugs will work best on cars that are stage 2 or higher. 

Spark Plug Specs:

Gap Size: 0.7mm
Manufacturer Heat Range: 24

Insulator Projection (mm): -1.0