E3.18 diamond fire spark plug. Lifetime guarantee. More power, efficiency & fewer emissions. Replaces champion n4c, n5c, n7yc, rn4c, rn5c, rn7yc, replaces ngk b4es, b5eb, b5es, bev, b6eb, b6eb11, b6es, b6es11, b6eb, b7eb, b7eb11, bp7es, bp7es11, bpr7es, bpr7es11, br4es, br5eb, br5es, br6eb, br6eb11, br6es, br6es11, br7eb11, bur7ea11, bur7eb11, replaces autolite 403, 404, 4055, 4056 & xst4055.
- Diamond-Fire Technology-Lifetime Warranty
- Greater Fuel Economy (up to 13%)
- More Horsepower (up to 12%)
- Fewer Emissions (cut by more than half)
- Quicker Starts
