Limited Lifetime Warranty; this just might be the last spark plug you'll ever buy. The patented DiamondFIRE technology produces a no foul spark plug that improves fuel economy up to 13%, increases power up to 12% and reduces emissions up to 58%. Replaces Champion CJ6, CJ6Y, RCJ6, RCJ6Y, CJ7Y, RCJ7Y, CJ8, CJ8Y, RCJ8, RCJ8Y & 5843.
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