*This listing and price is for a single spark plug.

Here is what TRD says about their product:

What is an iridium spark plug?

-High-output, high-rev sports car engines require a spark plug that is able to withstand the loads generated by such high power, and that can guarantee reliable ignition. TRD employs a new iridium alloy as the precious metal for the center electrode, to achieve a super-fine tip diameter of 0.4 mm, compared to platinum's 0.7-mm diameter. This greatly improves ignitability over platinum by decreasing the voltage required to spark, and allows you to maximize the response of high-performance engines.

Selecting for heat

-Based on data taken under the harsh conditions at races and rallies, TRD spark plugs exhibit powerful, stable, and consistent results even under high-load, high-speed driving conditions, so that your engine can accelerate smoothly. We make available five heat value types to best suit your engine performance characteristics, giving you a choice of the optimum heat value. (The higher the heat value, the faster the plug radiates heat and cools.)

- A high plug number does mean you'll be able to go faster. If the plug number is too high, the engine may hesitate at low revs. If it is too low, pick up will worsen. So, we recommend you choose a plug that best suits your driving patterns.

TRD IRIDIUM SPARK PLUG [SPORTS]

Excellent for powerful, sporty cars

Improves output to achieve powerful acceleration.

Helps to further reduce fuel costs in compact cars

Improves fuel economy and reduces pollution.

Stabilizes engine combustion

Stabilizes idling RPMs, decreasing engine noise.

Gentle even on old cars

Works at low voltage, reducing loads on plug cords and other parts of the electrical system.

Sparked by the motor sports division of the Toyota group and made by TRD, the most reliable name in quality and reliability in the Toyota customization field.

*You have the choice between the #7 & #8 Spark Plug. Please specify which spark plug # you wish to purchase at the point of sale.

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