Vivid racing carries iridium spark plugs by denso for your vehicle. these plugs are designed for cars running more horsepower. as you increase power, the need for a faster colder spark is necessary for proper tuning. these spark plugs are a great upgrade for all cars in all stages. they are sold individually. densos iridium power spark plugs help your vehicle achieve unparalleled performance. It alters the belief that a mere spark plug can add power and mileage. This is done by combining an iridium center electrode with a tapered cut u-groove ground electrode. Iridium conducts electricity better than platinum,...(choose a part on the right to read more)