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This DENSO IQ01-31 is a premium iridium spark plug engineered for the demands of racing. Its advanced iridium alloy construction provides superior durability and a lower required voltage for ignition, leading to a stronger spark and more efficient combustion. The design focuses on delivering consistent performance under extreme conditions. This translates to improved throttle response and power output for your vehicle. Choose DENSO for reliable ignition components that can withstand the rigors of competitive driving.