【Iridium Spark Plugs】The precious metal iridium in iridium spark plugs has the characteristics of high melting point, high strength and high hardness, Use of high-quality iridium spark plugs, its central electrode using fine iridium, to achieve a more superior ignition, significantly improved sensitivity, iridium spark plugs can make a stable jump fire, improve engine running stability and smoothness, while due to the hardness of iridium, making more durable than ordinary spark plugs.
【SP546 Spark Plug 】They are the upgraded design which is their fix to their original mistake of a plug.The original spark plugs are made of Platinum material, while we use Iridium material.The precious metal iridium in iridium spark plugs has the characteristics of high melting point, high strength and high hardness, To achieve a more superior ignition, significantly improved sensitivity, iridium spark plugs can make a stable jump fire, improve engine running stability and smoothness
【Improved Fuel Efficiency, Lower Emissions and Quicker starts】Iridium offers better engine idle stability and smoother performance,allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration.
【Replaces Part Number】 SP546, PZT14F, PZT1F, PZT2F, PZT2FF4, SP421, SP462, SP507,SP515..Please Check the fitment data with Part Finder or Amazon confirm fit..
【Replace Tips】Choosing higher grade spark plugs, such as Iridium spark plugs, can be effective in improving ignition efficiency and reducing carbon buildup. Use some of the easy-to-remove tools released but only an experienced technician can ensure that the spark plugs are replaced without damaging them. Suggestion: Do not attempt to remove the plugs from a warm or hot engine, do not use air or power tools to remove the plugs, use hand tools only.