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DENSO Iridium Racing Spark Plug [IRL01-27] 5754

DENSO Iridium Racing Spark Plug [IRL01-27] 5754


DENSO Racing SparkPlug IRL0127 - Single Plug


Single Plug


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DENSO Iridium Racing Spark Plug [IRL01-27] 5754

Please use our DENSO Spark Plug Lookup or contact us to find the right spark plug for your car

DENSO has been setting the standard for spark plug technology since 1959. They develop all of their ranges in-house, and manufacture them in their own ISO9000 certified factories worldwide - with 'zero defects' as standard. They also provide this outstanding OE quality to the aftermarket. Including Standard, Platinum and Iridium, DENSO Spark Plugs cover a complete range of continually updated references. Guaranteeing optimum engine performance, choose DENSO Spark Plugs for every automotive, motorcycle, marine and small engine application.

DENSO's unique Iridium Racing plugs feature iridium-rhodium alloy and a platinum tip on the ground electrode - for ultimate acceleration, engine output, ignition and spark voltage out on the circuit. These ultimate plugs have been specially tested and developed by DENSO for top level motor racing to give drivers superb engine response and unbeatable reliability - even in the most demanding conditions.

These plugs are recommended for drivers who care about:

  • Improved Acceleration
    Unbeatable acceleration performance on the circuit. With 0.4 mm diameter centre electrode, Iridium Racing plugs are the realisation of superb ignition performance and spark voltage at unparalleled levels. Misfires have been controlled and will allow you to have steadily high levels of response and increased acceleration.
  • Improved Horse Power
    More power with an ideal combustion cycle. Through superb ignition performance and spark voltage, non-firing and misfires under a variety of conditions has been greatly reduced. As a result, combustion conditions have improved dramatically, increasing engine output.


  • Improved cold-starting
  • More efficient fuel consumption
  • Better engine performance and acceleration
  • Smoother idling performance and throttle response
  • Original equipment quality now available to the aftermarket
  • Plugs available for all applications
  • Handles extreme compression and boost levels
  • Ultimate performance and durability
  • Maximizes track time, minimizes downtime

Spark Plug Health Check

Use Spark Plugs To Check Your Engine Health
Read More

Heat Ranges Explained

Learn what a spark plugs heat range means, and how it can effect your engine
Read More

Heat Cross Reference

Use our spark plug heat range cross reference table
Cross Reference Heat Range

Technical PDF Downloads:

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We say...

"A premium, high-performance spark plug with extra-long life"