Once you start performing modifications that increase horsepower and torque such as a turbo-back exhaust system, intake, injectors, and a tune, going to a colder spark plug is required.
Here, you are looking at the Denso IKH24 (5346) Iridium Power Spark Plug. These are a 2-step colder spark plug, and it has been designed to provide durability under the most extreme of conditions, and the featured patented iridium alloy is six times harder and eight times stronger than conventional platinum, and can handle temperatures in excess of 4000°F.
Note that these are sold individually.
