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The Iridium TT Twin Tip Technology delivers far less obstruction to the spark allowing an omni-directional explosion. This minimizes the quenching effect and results in a more effective, more complete combustion. Better combustion means more power and better fuel economy, as fuel is burned more efficiently with each piston firing. The large center and ground electrodes seen on a Standard Plug increases “quenching” of the explosion, meaning the spark explosion is restricted by the electrodes above and below the gap, allowing it to spread to either side, but not grow with full range.


  • The Iridium TT's two tips (a 0.4-mm Iridium center electrode, and a 0.7mm Platinum ground electrode) allow the spark plug to create the largest spark concentration and explosion.
  • Denso's patented Twin-Tip technology was first used on original equipment spark plugs for luxury and performance cars. Now that technology is available to everyone.
  • Denso selected Iridium and engineered it with Rhodium to build the most durable alloy for spark plugs. The patented formula has the highest concentration of Iridium of any spark plug and outperforms in the most severe engine temperatures resisting oxidation and voltage wear for over 100,000 miles.
  • Titanium-enhanced alloy ground electrode.
  • 1.1mm Platinum Center Electrode.

What's in it for you?

  • Improved Fuel Economy
  • Faster Starts
  • Enhanced flame propagation for increased engine efficiency

Why purchase the Iridium TT Spark Plug?

Spark Plug Type Performance Differences

Center Electrode Tip Material Iridium Rhodium Alloy
Gap Size 0.040″
Ground Electrode Quantity 1
Hex Size 16.0 mm
Manufacturer Heat Range 16
Seat Type Gasket
Reach 26.50 MM
Resistance 5000 Ohms
Ground Electrode Tip Design Platinum Twin-Tip
Ground Configuration Twin-Tip
Ground Electrode Core Material Nickel
Center Electrode Core Material Copper
OE Parts Number IKH16TT

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