GReddy Iridium Tune L-8 Spark Plug SpecificationsMade in Japan by GReddy these cold spark plugs have been specifically designed to operate at higher temperatures helping to disperse heat inside the cylinders. This improves combustion overall performances and engine reliability reducing the risk of knocking.Particularly adapted to sporty and tuned Japanese engines they are fully compatible with the following engines :Nissan : VQ35DE (350Z...)VK45DESR20VE SR20VETSuzuki : M16A (Swift Sport ZC32)